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公路通行能力外文翻译文献

公路通行能力外文翻译文献(文档含中英文对照即英文原文和中文翻译)Highway Capacity And Levels of Service Capacity DefinedA generalized definition of capacity is: The capacity of any element of the highway system is the maximum number of vehicles which has a reasonable expectation of passing over that section (in either one or both directions) during a given time period under prevailing roadway and trafficconditions. A sampling of capacities for modern highway elements is as follows:Capacity in PassengerFacilityCars Freeways and expressways away from ramps and2000 weaving sections, per lane per hourTwo-Lane highways, total in both directions, per2000hourThree-lane highways, total in each direction, per2000hourTwelve-foot lane at signalized intersection, per hour1800of green signal time(no interference and idealprogression)In treating capacity，TRB Circular 212 divides freeways into components: basic freeway segments and those in the zone of influence of weaving areas and ramp junctions. Capacities of expressways，multilane highways，and two- and three-lane facilities also have the two components: basic and those in the zone of influence of intersections. Each of these is treated separately below.Speed-Volume-Capacity Relationships for BasicFreeway and Multilane Highway SegmentsA knowledge of the relationships among speed，volume，and capacity is basic to understanding the place of capacity in highway design and operation. Figurel3.1，which gives such a relationship for a single freeway or expressway lane, is used for illustrative purposes.If a lone vehicle travels along a traffic lane，the driver is free to proceed at the design speed. This situation is represented at the beginning of the appropriate curve at the upper left of Fig. 13.1. But as the number of vehicles in the lane increases, the driver's freedom to select speed is restricted. This restriction brings a progressive reduction in speed. For example，many observations have shown that，for a highway designed for 70 mph (113km/h)，when volume reaches 1900 passenger cars per hour，traffic is slowed to about 43 mph (69km/h). If volume increases further, the relatively stable normal-flow condition usually found at lower volumes is subject to breakdown. This zone of instability is shown by the shaded area on the right side of Fig. 13. 1. One possible consequence is that traffic flow will stabilize at about 2000 vehicles per hour at a velocity of 30 to 40 mph (48 to 64km/h) as shown by the curved solid line on Fig. 13. 1. Often，however , the quality of flow deteriorates and a substantial drop in velocity occurs; in extreme cases vehicles may come to a full stop. In this case the volume of flow quickly decreases as traffic proceeds under a condition known as …forced flow.‟ V olumes under forced flow are shown by the dashed curve at the bottom of Fig. 13. 1. Reading from that curve，it can be seenthat if the speed falls to 20 mph (32km/h)，the rate of flow will drop to 1700 vehicles per hour; at 10 mph （16km/h) the flow rate is only 1000;and,of course，if vehicles stop，the rate of flow is 0. The result of this reduction in flow rate is that following vehicles all must slow or stop，and the rate of flow falls to the levels shown. Even in those cases where the congestion lasts but a few seconds, additional vehicles are affected after the congestion at the original location has disappeared. A …shock wave’develops which moves along the traffic lane in the direction opposite to that of vehicle travel. Such waves have been observed several miles from the scene of the original point of congestion，with vehicles slowing or stopping and then resuming speed for no apparent reason whatsoever.Effects of the imposition of speed limits of 60, 50, and 40 mph are suggested by the dotted lines on Fig. 13. 1. A 55-mph (88km/h) curve could also be drawn midway between the 60 and 50 mph dotted curves to reflect the effects of the federally imposed 55-mph limit, but this is conjectural since the level of enforcement varies so widely.Vehicle spacing，or its reciprocal, traffic density, probably have the greatest effect on capacity since it generates the driver's feeling of freedom or constraint more than any other factor. Studies of drivers as they follow other vehicles indicate that the time required to reach a potential collision point，rather than vehicle separation，seems to control behavior. However，this time varies widely among drivers and situations. Field observations have recordedheadways (time between vehicles) ranging from 0. 5 to 2 sec, with an average of about 1. 5s.Thus，the calculated capacity of a traffic lane based on this 1. 5 s average, regardless of speed，will be 2400 vehicles per hour. But even under the best of conditions, occasional gaps in the traffic stream can be expected，so that such high flows are not common. Rather, as noted，they are nearer to 2000 passenger cars per hour.The ‘Level of Service’ ConceptAs indicated in the discussion of the relationships of speed, volume or density, and vehicle spacing, operating speed goes down and driver restrictions become greater as traffic volume increase. …Level of service‟ is commonly accepted as a measure of the restrictive effects of increased volume. Each segment of roadway can be rated at an appropriate level，A to F inclusive，to reflect its condition at the given demand or service volume. Level A represents almost ideal conditions; Level E is at capacity; Level F indicates forced flow.The two best measures for level of service for uninterrupted flow conditions are operating or travel speed and the radio of volume to capacity达到最大限度的广播，called the v/c ratio. For two- and three-lane roads sight distance is also important.Abbreviated descriptions of operating conditions for the various levels of service are as follows:Level A—Free flow; speed controlled by driver's desire，speed limits, orphysical roadway conditions.Level B—Stable flow; operating speeds beginning to be restricted; little or no restrictions on maneuverability from other vehicles.Level C—Stable flow; speeds and maneuverability more closely restricted.Level D—Approaches unstable flow; tolerable speeds can be maintained but temporary restrictions to flow cause substantial drops in speed. Little freedom to maneuver，comfort and convenience low.Level E—V olumes near capacity; speed typically in neighborhood of 30 mph (48km/h); flow unstable; stoppages of momentary duration. Ability to maneuver severely limited.Level F—Forced flow，low-operating speeds，volumes below capacity; queues formed.A third measure of level of service suggested in TRB Circular 212 is traffic density. This is，for a traffic lane，the average number of vehicles occupying a mile (1. 6km) of lane at a given instant. To illustrate，if the average speed is 50 mph，a vehicle is in a given mile for 72 s. If the lane carrying 800 vehicles per hour，average density is then 16 vehicles per mile ;spacing is 330 ft (100m)，center to center. The advantage of the density approach is that the various levels of service can be measured or portrayed in photographs.From: Clarkson H. Oglesby and R. Gary Hicks “Highwayengineering”, 1982公路通行能力和服务水平通行能力的定义道路通行能力的广义定义是：在繁忙的道路和交通条件下公路系统任何元素的通行能力是对在指定的时间通过一断面（一个或两个方向）的最大数量的车辆有一个合理的预期。

智能交通系统中英文对照外文翻译文献

智能交通系统中英文对照外文翻译文献(文档含英文原文和中文翻译)原文:Traffic Assignment Forecast Model Research in ITS IntroductionThe intelligent transportation system (ITS) develops rapidly along with the city sustainable development, the digital city construction and the development of transportation. One of the main functions of the ITS is to improve transportation environment and alleviate the transportation jam, the most effective method to gain the aim is to forecast the traffic volume of the local network and the important nodes exactly with GIS function of path analysis and correlation mathematic methods, and this will lead a better planning of the traffic network. Traffic assignment forecast is an important phase of traffic volume forecast. It will assign the forecasted traffic to every way in the traffic sector. If the traffic volume of certain road is too big, which would bring on traffic jam, planners must consider the adoption of new roads or improving existing roads to alleviate the traffic congestion situation. This study attempts to present an improved traffic assignment forecast model, MPCC, based on analyzing the advantages and disadvantages of classic traffic assignment forecast models, and test the validity of the improved model in practice.1 Analysis of classic models1.1 Shortcut traffic assignmentShortcut traffic assignment is a static traffic assignment method. In this method, the traffic load impact in the vehicles’ travel is not considered, and the traffic impedance (travel time) is a constant. The traffic volume of every origination-destination couple will be assigned to the shortcut between the origination and destination, while the traffic volume of other roads in this sector is null. This assignment method has the advantage of simple calculation; however, uneven distribution of the traffic volume is its obvious shortcoming. Using this assignment method, the assignment traffic volume will be concentrated on the shortcut, which isobviously not realistic. However, shortcut traffic assignment is the basis of all theother traffic assignment methods.1.2 Multi-ways probability assignmentIn reality, travelers always want to choose the shortcut to the destination, whichis called the shortcut factor; however, as the complexity of the traffic network, thepath chosen may not necessarily be the shortcut, which is called the random factor.Although every traveler hopes to follow the shortcut, there are some whose choice isnot the shortcut in fact. The shorter the path is, the greater the probability of beingchosen is; the longer the path is, the smaller the probability of being chosen is.Therefore, the multi-ways probability assignment model is guided by the LOGIT model:∑---=n j ii i F F p 1)exp()exp(θθ (1)Where i p is the probability of the path section i; i F is the travel time of thepath section i; θ is the transport decision parameter, which is calculated by the followprinciple: firstly, calculate the i p with different θ (from 0 to 1), then find the θwhich makes i p the most proximate to the actual i p .The shortcut factor and the random factor is considered in multi-ways probabilityassignment, therefore, the assignment result is more reasonable, but the relationshipbetween traffic impedance and traffic load and road capacity is not considered in thismethod, which leads to the assignment result is imprecise in more crowded trafficnetwork. We attempt to improve the accuracy through integrating the several elements above in one model-MPCC.2 Multi-ways probability and capacity constraint model2.1 Rational path aggregateIn order to make the improved model more reasonable in the application, theconcept of rational path aggregate has been proposed. The rational path aggregate,which is the foundation of MPCC model, constrains the calculation scope. Rationalpath aggregate refers to the aggregate of paths between starts and ends of the trafficsector, defined by inner nodes ascertained by the following rules: the distancebetween the next inner node and the start can not be shorter than the distance betweenthe current one and the start; at the same time, the distance between the next innernode and the end can not be longer than the distance between the current one and theend. The multi-ways probability assignment model will be only used in the rationalpath aggregate to assign the forecast traffic volume, and this will greatly enhance theapplicability of this model.2.2 Model assumption1) Traffic impedance is not a constant. It is decided by the vehicle characteristicand the current traffic situation.2) The traffic impedance which travelers estimate is random and imprecise.3) Every traveler chooses the path from respective rational path aggregate.Based on the assumptions above, we can use the MPCC model to assign thetraffic volume in the sector of origination-destination couples.2.3 Calculation of path traffic impedanceActually, travelers have different understanding to path traffic impedance, butgenerally, the travel cost, which is mainly made up of forecast travel time, travellength and forecast travel outlay, is considered the traffic impedance. Eq. (2) displaysthis relationship. a a a a F L T C γβα++= (2)Where a C is the traffic impedance of the path section a; a T is the forecast traveltime of the path section a; a L is the travel length of the path section a; a F is theforecast travel outlay of the path section a; α, β, γ are the weight value of that threeelements which impact the traffic impedance. For a certain path section, there aredifferent α, β and γ value for different vehicles. We can get the weighted average of α,β and γ of each path section from the statistic percent of each type of vehicle in thepath section.2.4 Chosen probability in MPCCActually, travelers always want to follow the best path (broad sense shortcut), butbecause of the impact of random factor, travelers just can choose the path which is ofthe smallest traffic impedance they estimate by themselves. It is the key point ofMPCC. According to the random utility theory of economics, if traffic impedance is considered as the negativeutility, the chosen probability rs p of origination-destinationpoints couple (r, s) should follow LOGIT model:∑---=n j jrs rs bC bC p 1)exp()exp( (3) where rs p is the chosen probability of the pathsection (r, s);rs C is the traffic impedance of the path sect-ion (r, s); j C is the trafficimpedance of each path section in the forecast traffic sector; b reflects the travelers’cognition to the traffic impedance of paths in the traffic sector, which has reverseratio to its deviation. If b → ∞ , the deviation of understanding extent of trafficimpedance approaches to 0. In this case, all the travelers will follow the path whichis of the smallest traffic impedance, which equals to the assignment results withShortcut Traffic Assignment. Contrarily, if b → 0, travelers ’ understanding error approaches infinity. In this case, the paths travelers choose are scattered. There is anobjection that b is of dimension in Eq.(3). Because the deviation of b should beknown before, it is difficult to determine the value of b. Therefore, Eq.(3) is improvedas follows:∑---=n j OD j OD rsrs C bC C bC p 1)exp()exp(，∑-=n j j OD C n C 11（4） Where OD C is the average of the traffic impedance of all the as-signed paths; bwhich is of no dimension, just has relationship to the rational path aggregate, ratherthan the traffic impedance. According to actual observation, the range of b which is anexperience value is generally between 3.00 to 4.00. For the more crowded cityinternal roads, b is normally between 3.00 and 3.50.2.5 Flow of MPCCMPCC model combines the idea of multi-ways probability assignment anditerative capacity constraint traffic assignment.Firstly, we can get the geometric information of the road network and OD trafficvolume from related data. Then we determine the rational path aggregate with themethod which is explained in Section 2.1.Secondly, we can calculate the traffic impedance of each path section with Eq.(2),Fig.1 Flowchart of MPCC which is expatiated in Section 2.3.Thirdly, on the foundation of the traffic impedance of each path section, we cancalculate the respective forecast traffic volume of every path section with improvedLOGIT model (Eq.(4)) in Section 2.4, which is the key point of MPCC.Fourthly, through the calculation processabove, we can get the chosen probability andforecast traffic volume of each path section, but itis not the end. We must recalculate the trafficimpedance again in the new traffic volumesituation. As is shown in Fig.1, because of theconsideration of the relationship between trafficimpedance and traffic load, the traffic impedanceand forecast assignment traffic volume of everypath will be continually amended. Using therelationship model between average speed andtraffic volume, we can calculate the travel timeand the traffic impedance of certain path sect-ionunder different traffic volume situation. For theroads with different technical levels, therelationship models between average speeds totraffic volume are as follows: 1) Highway: 1082.049.179AN V = (5) 2) Level 1 Roads: 11433.084.155AN V = (6) 3) Level 2 Roads: 66.091.057.112AN V = (7) 4) Level 3 Roads: 3.132.01.99AN V = (8) 5) Level 4 Roads: 0988.05.70A N V =(9) Where V is the average speed of the path section; A N is the traffic volume of thepath section.At the end, we can repeat assigning traffic volume of path sections with themethod in previous step, which is the idea of iterative capacity constraint assignment,until the traffic volume of every path section is stable.译文智能交通交通量分配预测模型介绍随着城市的可持续化发展、数字化城市的建设以及交通运输业的发展，智能交通系统（ITS）的发展越来越快。

交通运输与物流专业中英文对照外文翻译文献

(文档含英文原文和中文翻译)中英文翻译税收和运输外部性摘要综述的运输外部控制税收的作用（资料评论到税收的作用在于控制交通运输的运营状况）。

它认为，运输税的设计应预先考虑到现有的税收扭曲经济的影响（设计运输税时应该考虑到现有税收对经济的负面影响），在决策者的处置运输手段的限制。

运输定价的公平考虑的相关性探讨。

引言对欧盟数据显示乘客驾驶汽车行驶的公里数，1999是1970的两点五倍,汽车驾驶占有的份额达到79%( 1970年74%)。

在美国汽车运输中，汽车运输比例甚至在总额行驶千米数占更高比例， (1998年是84%)。

在1999年，欧盟的75%货物运输(包括短程海运和航运) 是通过公路运输的。

而美国的30%是公路运输(欧洲委员会,2001)。

汽车和卡车的模式在各自的运输市场占据着大份额，这反应出出它们的特性，比如灵活性和舒适性。

然而，当家庭和企业决定是否需要进行一个旅行，什么时候进行，采取什么旅行模式和途径，他们只会把自己的成本和收益考虑进去。

与社会最优化相比，由此产生的交通需求太高。

它在集中在特殊时刻的日子，分享不同的模式时是次优的。

这是因为，总体上，每个额外的运输用户还会增加其他运输用户和社会成本。

在人们决策过程中，这些没有考虑进去的成本是外部成本。

这些交通运输主要的边际外部成本包括交通堵塞，交通意外，环境成本和路面损坏 (针对重型车辆)。

大多数这些外部性具有一个反馈效应的特性:外部本身的水平也会影响经济主体的行为。

最明显的例子是交通堵塞和交通事故。

时间的成本影响着客运和货运交通的需求。

同样的道理,事故的风险影响着运输需求,模式的选择、路线的选择和驾驶行为等等。

反馈效应影响也包括空气污染和噪音,因为这些将导致厌恶或减轻此行为。

政府可以利用一些工具来应对这些外因素。

总体来说,一个人可以区分定价、监管和基础设施政策。

最后一类非常广泛。

例如, 它不仅包括实体基础设施或虚拟基础设施膨胀的能力,但也包括空间规划。

物流外文文献及翻译

物流外文文献及翻译 Updated by Jack on December 25,2020 at 10:00 am文献出处: Mahpula A. The Research of Regional Logistics Competitiveness [J]. Journal of Transport Geography, 2015, 15(2): 30-34.原文The Research of Regional Logistics CompetitivenessMahpula AAbstractAt present, the development of logistics is the logistics demand rapid increase, the expanding market capacity, accelerates the construction of logistics infrastructure, third-party logistics fast growth the tendency, the whole logistics industry is developing in the direction of the information, globalization and specialization. At the same time, with the rapid increase of logistics demand, the development of the regional logistics more rapidly. Regional logistics is an important part of regional economy, the existence and development of regional logistics is the premise of existence and development of regional economy, no regional economy there would be no regional logistics. Regional logistics and regional economic development level, is closely related to the scale and the level of the different regional economic shape, size and industry, determines the level of regional logistics, the scale and structure form. Regional economic integration can make the area and regional logistics incline to reasonable, adapt to reasonable layout of industrial structure, to reduce logistics cost, promote the development of regional logistics. On the other hand, the regional economic development is inseparable from the development of regional logistics and regional logistics to provide support and guarantee for the development of regional economy, the development of the regional logistics will drive and promote the further development of regional economy. Therefore, the development of the regional logistics has become to improve the regional investment environment and industry development environment, expanding the scope of the regional influence, the key to enhancing regional competitiveness.Keywords: Regional logistics; Regional logistics competitiveness; Evaluation index 1 IntroductionThe rapid development of world economy and the progress of modern science and technology, the logistics industry as an emerging service industry, is developing rapidly in the global scope. Internationally, logistics industry is considered to be the economic development of the artery and basic industry, its development degreebecome to measure a country's modernization degree and comprehensive national strength, one of the important marks is known as the "third profit source" of the enterprise, its role is more and more big, became the current after the IT industry, financial industry's hottest emerging industry a new growth point of national economy, and caused widespread social attention. Regional logistics is an important component of regional economy, is the important force in the formation and development of regional economy, it is to improve the efficiency and economic benefit in the field of regional circulation, improve the competitive ability of regional market, etc., plays a positive role in active. Behind the rapid development of modern logistics, however, there are still many problems; including logistics competitiveness level is lower than the level of logistics development is particularly prominent. Choosing logistics competitiveness development level evaluation index, since there is no uniform standard, can only use freight or freight turnover scale to measure logistics. Implementation of goods transport is the process of logistics spatial displacement at the center of the link, with the two indicators to measure logistics scale has certain scientific, but it can't reflect the outline of the regional logistics. Estimates of logistics demand, typically based on GDP and total retail sales of social consumer goods such as index of national economic accounting. This is just a simple measure of the macro level, the proportion of different researchers use different, ranging from teens to twenty percent, there are large difference between the results and gives theoretical analysis greater difficulties. At the same time, the logistics industry's economic statistical data shortage, there is no comprehensive logistics demand statistics, which made us qualitative understanding of the level of understanding of logistics.2 Literature reviewAbout the Core Competence theory, Core Competence (Core Competence) of the original intention is the Core skills or Core skills, this concept is in 1990 by the American strategic management experts made rahalad) and Britain's strategic management experts hamer (c. amel), refers to the enterprise organization of accumulating knowledge, especially about how to coordinate different production skills and integrate a variety of technical knowledge, and on the basis of advantage over other competitors unique ability, namely Core Competence is built on the basisof enterprise Core resources, is the enterprise intelligence, technology, products, management, culture and other elements in the reflection of comprehensive advantagein the market. At present there are three typical academic argument: the ability theory represented by Rossby and Christie's school; School represented by porter's theory of market structure; Represented by Werner Phil and Penrose's theory of resource school. Core competitiveness is value, the ability to integrated, uniqueness, extensibility and inherent characteristics.Related theory, the study of regional logistics, the logistics research of Europe and the United States, Japan and other developed countries, focus on the enterprise level, is committed to providing enterprise optimization strategy. And regional logistics system and competitiveness research, involved. According to literature review, the regional international logistics field of research mainly includes the following aspects: (1) from the perspective of multinational company research the global logistics resources configuration and coordination problems. Specific include logistics infrastructure, market competition mechanism and the problem of logistics supply chain operation. Such research quantification technology such as using the operational research tools, more for the global network of supply chain facility location positioning, and coordinate the factory more support, strategic distribution system design problem. This is an extension of the logistics enterprise level optimization study, the commonly used methods include mathematical analytical method, system simulation method and heuristic methods, etc. If only one method and graphical method solving the problem of the layout of the site; Mixed integer programming solve the problem of site selection of logistics center and logistics planning, etc.(2) from the perspective of urban economy and the environment, the research of urban traffic network Settings. For example Tanjguchietal from the city level, using a dynamic traffic simulation model, quantitative research economic growth, the transport demand, as well as the related road congestion and environmental pollution.(3) from the point of view of the city government, study its role in macro logistics development and utility. For example MeirJ. R and Senblatt, studied the global supply chain management in infrastructure financing, transportation and regional trading rules, corporate tax law of the government subsidies, and other effects of the main factors of global production and distribution network, etc.3 Introduction to the theory of regional logistics relatedThe definition of regional logisticsAcademic definition of regional logistics has not yet unified, a more accepted view is that regional logistics is the geographical environment in a certain area, with large and medium-sized cities as the center, based on the regional scale and scope economy, combined with effective logistics service scope, area inside and outside of all kinds of goods from the supplier to accept to effective entity flow; Is the transport, storage, loading and unloading, handling, distribution, packaging, circulation processing, information processing, such as integrated logistics activities, to service in the composite system of regional economic development. It requires the integration, the integration of logistics management, namely to meet user needs for the purpose, to the goods, services and related information from the supplier to accept to the efficient flow of planning, execution, and control activities, is the organic unity of cash-flow, information flow and cash flow.Relationship of regional logistics subject, object and carrierRegional logistics has the characteristics of multi-level and multi-dimensional structure, its basic elements include logistics main body, object and logistics carrier, and the structure of the basic elements and their complete system, each element show different features, thus forming the function of the regional logistics. Regional logistics main body is directly involved in or specialized is engaged in the economic organization of regional logistics activity, including the owner of the goodsFlow, the third party logistics enterprise, storage and transportation enterprise, etc. Logistics is the supply chain logistics channels, the starting point and end point of connection in the whole course of the regional logistics activity plays a dominant and decisive role. Elements of the integrated logistics subject is the essential characteristic of modern logistics. Therefore, the elements of logistics as one of the main body, logistics has a decisive role in the development of logistics industry. Similar accumulation and regional economy industry, regional logistics also emphasizes the logistics main body accumulation, logistics main body in space is beneficial to promote the logistics activities of large-scale, intensive, body development, it is also a regional logistics park, logistics center, the objective basis of the formation of distribution centers, and regional logistics park, logistics center and distribution center determines the spatial structure of the regional logistics system.Regional logistics and regional economic relationsRegional logistics is an important part of regional economy, the existence and development of regional logistics is the premise of existence and development of regional economy, no regional economy there would be no regional logistics. Regional logistics and regional economic development level, is closely related to the scale and the level of the different regional economic shape, size and industry, determines the level of regional logistics, the scale and structure form. Logistics is always accompanied by business flow, the more advanced the regional economy, manufacturing and trading more active, the logistics industry as a service industry will have a good customer base and market infrastructure, the greater the chance of large-scale development. On the other hand, the regional economic development is inseparable from the development of regional logistics and regional logistics to provide support and guarantee for the development of regional economy, the development of the regional logistics will drive and promote the further development of regional economy. Thus, regional logistics and regional economy is the unity of interdependence. Regional economy is the premise and foundation of regional logistics development, is the dominant force in the regional logistics development; Regional logistics is an important part of regional economy, is the regional economic support system, and serve the regional economy. Regional logistics development goal and strategy must obey and serve the regional economic development goals and strategies.4 Regional logistics competitivenessRegional logistics competitiveness refers to a certain space range (general administrative area as the border, across regions), the logistics industry are different from other areas of the assignment of resources was made in the advantage, the logistics enterprises, government policy support and industrial innovation ability, eventually embodied through regional internal benign competition will be more than all kinds of resources, the ability to effectively integrate to form a complementary and integrated ability system, reflect the regional comparison of competitive power in the logistics activity, reflect the size of the regional logistics service ability and the logistics industry development level of high and low. The competitiveness of the regional logistics is mainly composed of six basic elements constitute: social and economic development level, scale of logistics demand and supply condition oflogistics, the logistics development of logistics industry in the enterprise information development level, development level, the macro environment.The social and economic development levelComprehensive social and economic development level reflects the regional logistics competitiveness level of social economic basis, is the guarantee of development of regional logistics competitiveness, to provide support for the sustainable development of regional logistics, from the other side also reflects the competitiveness of regional logistics development potential and power.The logistics demand scaleLogistics demand scale is mainly refers to the logistics services in the field such as production, consumption and circulation quantity and scale, to some extent, restricted by local resource conditions, it reflects a region, the demand for logistics service level and size: the size of the logistics demand, determines the size of the logistics market capacity, is the premise of existence and development of regional logistics industry and the foundation.Logistics supply conditionThe supply condition of logistics refers to the logistics infrastructure provided for the development of the logistics industry, all kinds of logistics technology and equipment, is engaged in the logistics services enterprises and the corresponding professionals such as the number and size of traffic capacity and regional situation, the comprehensive reflection of regional logistics supply capacity and service level, reflects the effect on the development of the logistics industry to promote and satisfaction, is the main factor of the formation and development of regional logistics competition.Logistics enterprise development levelLogistics enterprise comprehensive development level reflects the regional logistics main body's ability to provide logistics services and meet customer demand, embodies the subject of logistics operation level, mainly including the enterprise competition ability, profit ability and performance level, reflect a certain period of logistics enterprises in the area of the overall level of development, is the key factor for the formation of regional logistics competitiveness.Information development levelMainly refers to the regional information development level of information degree and the level of information technology. Logistics is based on information flow, logistics has become more and more rely on the whole process of access to information. Many logistics enterprises have established their own information management system as a crucial to the development of its core competitiveness, the development level of information is the one important factor for the formation of regional logistics competitiveness level.Logistics macro environmentMacro environment refers to the logistics industry development of logistics industry development planning, land use policy, tax policy, market access policy, talent training, such as the soft environment, affecting the development of logistics industry reflects the external environment for the development of the logistics industry to provide favorable conditions and the environment support.译文区域物流竞争力研究作者 Mahpula A摘要当前，物流的发展正呈现出物流需求快速上升、市场容量不断扩大、物流基础设施建设加速、第三方物流快速成长的趋势，整个物流产业正朝着信息化、全球化和专业化的方向发展。

交通工程专业外文翻译外文文献英文文献

土木工程学院交通工程专业中英文翻译Road Design专业：交通工程英文原文The Basics of a Good RoadWe have known how to build good roads for a long time. Archaeologists have found ancient Egyptian roadsthat carried blocks to the pyramids in 4600 BCE. Later,the Romans built an extensive road system, using the same principles we use today. Some of these roads are still in service.If you follow the basic concepts of road building, you will create a road that will last. The ten commandments of a good road are:（1）Get water away from the road（2）Build on a firm foundation（3）Use the best materials（4）Compact all layers properly（5）Design for traffic loads and volumes（6）Design for maintenance（7）Pave only when ready（8）Build from the bottom up（9）Protect your investment（10）Keep good records1．Get water away from the roadWe can’t overemphasize the importance of good drainage.Engineers estimate that at least 90% of a road’s problems can be related to excess water or to poor waterdrainage. Too much water in any layer of a road’sstructure can weaken that la yer, leading to failure.In the surface layer, water can cause cracks and potholes. In lower layers it undermines support, causing cracks and potholes. A common sign of water in an asphalt road surface is alligator cracking — an interconnected pattern of cracks forming small irregular shaped pieces that look like alligator skin. Edge cracking, frost heaves, and spring breakup of pavements also point to moistureproblems.To prevent these problems remember that water:• flows downhill• needs to flow somepla ce• is a problem if it is not flowingEffective drainage systems divert, drain and dispose of water. To do this they use interceptor ditches and slopes,road crowns, and ditch and culvert systems.Divert —Interceptor ditches, located between the road and higher ground along the road, keep the water from reaching the roadway. These ditches must slope so they carry water away from the road.Drain —Creating a crown in the road so it is higher along the centerline than at the edges encourages water to flow off the road. Typically a paved crown should be 1⁄4" higher than the shoulder for each foot of width from the centerline to the edge. For gravel surfaces the crown should be 1⁄2" higher per foot of width. For this flow path to work, the road surface must be relatively water tight. Road shoulders also must be sloped away from the road to continue carrying the flow away. Superelevations (banking) at the outside of curves will also help drainthe road surface.Dispose —A ditch and culvert system carries water away from the road structure. Ditches should be at least one foot lower than the bottom of the gravel road layer that drains the roadway. They must be kept clean and must be sloped to move water into natural drainage. If water stays in the ditches it can seep back into the road structure and undermine its strength. Ditches should also be protected from erosion by planting grass, or installing rock and other erosion control measures. Erosion can damage shoulders and ditches, clog culverts, undermine roadbeds, and contaminate nearby streams and lakes. Evaluate your ditch and culvert system twice a year to ensure that it works. In the fall, clean out leaves and branches that can block flow. In spring, check for and remove silts from plowing and any dead plant material left from the fall.2．Build on a firm foundationA road is only as good as its foundation. A highway wears out from the top down but falls apart from the bottom. The road base must carry the entire structure and the traffic that uses it.To make a firm foundation you may need to stabilize the roadbed with chemical stabilizers, large stone called breaker run, or geotextile fabric. When you run into conditions where you suspect that the native soil is unstable, work with an engineer to investigate the situation and design an appropriate solution.3．Use the best materialsWith all road materials you “pay now or pay later.” Inferior materials may require extensive maintenance throughout the road’s life. They may also force you to replace the road prematurely.Crushed aggregate is the best material for the base course. The sharp angles of thecrushed material interlock when they are compacted. This supports the pavement and traffic by transmitting the load from particle to particle. By contrast, rounded particles act like ballbearings, moving under loads.Angular particles are more stable than rounded particles.Asphalt and concrete pavement materials must be of the highest quality, designed for the conditions, obtained from established firms, and tested to ensure it meets specifications.4．Compact all layersIn general, the more densely a material is compacted, the stronger it is. Compaction also shrinks or eliminates open spaces (voids) between particles. This means that less water can enter the structure. Water in soil can weaken the structure or lead to frost heaves. This is especially important for unsurfaced (gravel) roads. Use gravel which has a mix of sizes (well-graded aggregate) so smaller particles can fill the voids between larger ones. Goodcompaction of asphalt pavement lengthens its life.5．Design for traffic loads and volumesDesign for the highest anticipated load the road will carry. A road that has been designed only for cars will not stand up to trucks. One truck with 9 tons on a single rear axle does as much damage to a road as nearly 10,000 cars.Rural roads may carry log trucks, milk trucks, fire department pumper trucks, or construction equipment. If you don’t know what specific loads the road will carry, a good rule of thumb is to design for the largest piece of highway maintenance equipment that will be used on the road.A well-constructed and maintained asphalt road should last 20 years without major repairs or reconstruction. In designing a road, use traffic counts that project numbers and sizes of vehicles 20 years into the future. These are only projections, at best, but they will allow you to plan for traffic loadings through a road’s life.6．Design for maintenanceWithout maintenance a road will rapidly deteriorate and fail. Design your roads so they can be easily maintained. This means:• adequate ditches that can be cleaned regularly• culverts that are marked for easy locating in the spring• enough space for snow after it is plowed off the road• proper cross slopes for safet y, maintenance and to avoid snow drifts• roadsides that are planted or treated to prevent erosion• roadsides that can be mowed safelyA rule of thumb for adequate road width is to make it wide enough for a snowplow to pass another vehicle without leaving the travelled way.Mark culverts with a post so they can be located easily.7．Pave only when readyIt is not necessary to pave all your roads immediately. There is nothing wrong with a well-built and wellmaintained gravel road if traffic loads and volume do not require a paved surface. Three hundred vehicles per day is the recommended minimum to justify paving.Don’t assume that laying down asphalt will fix a gravel road that is failing. Before you pave, make sure you have an adequate crushed stone base that drains well and is properly compacted. The recommended minimum depth of crushed stone base is 10" depending on subgrade soils. A road paved only when it is ready will far outperform one that is constructed too quickly.8．Ê Build from the bottom upThis commandment may seem obvious, but it means that you shouldn’t top dress or resurface a road if the problem is in an underlying layer. Before you do any road improvement, locate the cause of any surface problems. Choose an improvement technique that will address the problem. This may mean recycling or removing all road materials down to the native soil and rebuilding everything. Doing any work that doesn’t solve the problem is a waste of money and effort.9．Ê Protect your investmentThe road system can be your municipality’s biggest investment. Just as a home needs painting or a new roof, a road must be maintained. Wisconsin’s severe climate requires more road maintenance than in milder places. Do these important maintenance activities: Surface —grade, shape, patch, seal cracks, control dust, remove snow and iceDrainage —clean and repair ditches and culverts; remove all excess materialRoadside —cut brush, trim trees and roadside plantings, control erosionTraffic service —clean and repair or replace signsDesign roads with adequate ditches so they can be maintained with a motor grader. Clean and grade ditches to maintain proper pitch and peak efficiency. After grading, remove all excess material from the shoulder.10．Keep good recordsYour maintenance will be more efficient with good records. Knowing the road’s construction, life, and repair history makes it much easier to plan and budget its future repairs. Records can also help you evaluate the effectiveness of the repair methods and materials you used.Good record keeping starts with an inventory of the system. It should include the history and surface condition of the roadway, identify and evaluate culverts and bridges, note ditch conditions, shoulders, signs, and such structures as retaining walls and guardrails.Update your inventory each year or when you repair or change a road section. A formal pavement management system can help use these records and plan and budget road improvements.ResourcesThe Basics of a Good Road#17649, UW-Madison, 15 min. videotape. Presents the Ten Commandments of a Good Road. Videotapes are loaned free through County Extension offices.Asphalt PASER Manual(39 pp), Concrete PASER Manual (48 pp), Gravel PASER Manual (32 pp). These booklets contain extensive photos and descriptions of road surfacesto help you understand types of distress conditions and their causes. A simple procedure for rating the condition helps you manage your pavements and plan repairs.Roadware, a computer program which stores and reports pavement condition information. Developed by the Transportation Information Center and enhanced by the Wisconsin Department of Transportation, it uses the PASER rating system to provide five-year cost budgets and roadway repair/reconstruction priority lists.Wisconsin Transportation Bulletin factsheets, available from the Transportation Information Center (T.I.C.).Road Drainage, No. 4. Describes drainage for roadways, shoulders, ditches, and culverts.Gravel Roads, No. 5. Discusses the characteristics of a gravel road and how to maintain one.Using Salt and Sand for Winter Road Maintenance,No. 6. Basic information and practical tips on how to use de-icing chemicals and sand.Culverts—Proper Use and Installation, No. 15. Selecting and sizing culverts, designing, installing and maintaining them.Geotextiles in Road Construction/Maintenance andErosion Control, No. 16. Definitions and common applications of geotextiles on roadways and for erosion control.T.I.C. workshops are offered at locations around the state.Crossroads,an 8-page quarterly newsletter published by the T.I.C. carries helpful articles, workshop information, and resource lists. For more information on any of these materials, contact the T.I.C. at 800/442-4615.中文译文一个良好的公路的基础长久以来我们已经掌握了如何铺设好一条道路的方法，考古学家发现在4600年古埃及使用建造金字塔的石块铺设道路，后来，罗马人使用同样的方法建立了一个庞大的道路系统，这种方法一直沿用到今天。

物流外文翻译外文文献英文文献中国快递行业研究报告

2011年中国快递行业研究报告——China Express Delivery Industry Report, 2011 Enterprise wide USD $ 3300 Release Date Dec.2011AbstractIn July, 2011, in the “Twelfth Five-Year (2011-2015)” plan on the development of postal industry issued by State Post Bureau of the Peo ple’s Republic of China, the following “twelfth five-year” development indicators were put forward for the express delivery industry: the network coverage of key express delivery enterprises came up to 98% in municipalities and provincial capitals, and over 90% in provincially administered municipalities; and the key express delivery enterprises realized the 72-hour inter-provincial capital and inter-key city express delivery rate of more than 90%, express delay rate of lower than 0.8%, damage rate of lower than 0.01%, and loss rate of lower than 0.005%.The express delivery business of China has witnessed rapid growth in 2011. Up to the end of September of 2011, Chinese express delivery companies (with annual sales of over RMB5 million) had made 2.52 billion deliveries, up 53.3% year-on-year, and harvested RMB53.14 billion, a 28.9% YoY rise, of which Chinese inner-city express business revenue was RMB4.67 billion, with the year-on-year increase of 58.1%; the cross regional express business revenue rose 37% year-on-year to RMB30.73 billion; and the international and Hong Kong, Macao and Taiwan business revenue was RMB13.57 billion, a slight rise of 4.9% from the same period of last year.From January to September of 2011, 1.125 billion deliveries were made in Guangdong, Zhejiang and Shanghai, accounting for 44.64% of the national business volume, and achieved RMB25.697 billion with a 48.36% share of the total business revenue in China.‘Research report on the express delivery industry in China’ mainly covers the followings:The twelfth five-year plan of national express delivery industry and the twelfth five-year plan of express delivery industry in key provinces and cities;Development status, business classification,λ market structure, price and competition structure of the express delivery industry in China;Analysis on the express delivery industry in importantλprovinces and cities in Guangdong, Shanghai, Beijing and Jiangsu etc.Performance of UPS, FedEx, DHL and TNT in Chinese express deliveryλ market.Development history, corporate operation, SWOT analysis and marketλstrategy of 15 local express delivery enterprises (including EMS, China Sinotrans Group, China Railway Express, Air Express, SF Express, STO Express, ZJS Express, YTO Express, Yunda Express, ZTO Express, etc.)EMS：The revenue of China Post Group footed up to RMB189.9 billion in 2010, presenting an AAGR of 18.5% during the 11th Five-Year Plan (2006-2010); wherein, the proceeds of express business saw an average growth rate of 19.2%. Currently, EMS possesses 16 cargo aircrafts, 40 national airlines, 2 international airlines, more than 20 thousand transportation vehicles, 8 collecting and distributing centers and 31 provincial distribution centers.SF Express: its operating revenue has maintained high-speed growth since 2003, with an AAGR of over 40%; and the figure in 2010 registered RMB12 billion. In August, 2011, SF Express increased RMB400 million to reshuffle stock rights of SF Airlines whose air fleet covers two Boeing 757-200 All-Cargo Aircrafts and three Boeing 737-300 Aircrafts at present.ZJS Express: its operating performance has saw a comparatively slow rise since 2004, and it made negative growth affected by economic crisis during 2008-2009. However, the operating revenue of the company hit around RMB2 billion in 2010, soaring 66.7% from a year earlier and setting a new high record.In next a few years, e-commerce will further drive the steady and rapid growth of the express delivery industry, and the operating costs will rise ever and spur the price hike of express delivery. As the market expands, for considerable benefit, a growing number of companies in the express delivery sector will be merged and reorganized, and the businesses of express delivery firms will be increasingly differentiated.2011年中国快递行业研究报告——中国快递行业研究报告，2011企业广泛$ 3300美元的发行日期dec.2011摘要在七月，2011，在“第十二个五年（年）”计划对邮政产业发展的国家邮政局发行的中国人民共和国，以下“第十二五”发展指标提出了快递行业：网络覆盖的关键快递企业走到98%直辖市、省会城市，和90%多个省直管市；和关键快递企业实现72小时省际资本和inter-key快递率超过90%，表示延迟率低于0.8%，破损率低于0.01%，损失率低于0.005%。

物流配送外文文献及翻译

1、 INTRODUCTIONLogistics is normally considered as nothing more than getting the right product to theright place at the right time for the least cost、 Faced with a rapidly changing environment, revolutionary changes in technology, continued government deregulation, the shortening of product life cycle, proliferation of product lines and shifts in traditional manufacturer-retailer relationships, many organisations have had to rethink their traditional assumptions、Over the last ten years one of the most significant changes in management thinking wasthe emphasis on the search for strategies that will provide superior value in competition、Logistics management has the potential to assist the organisation in the achievement of botha cost/productivity advantage and a value advantage、 The importance of logistics and its integration in the supply chain was argued by、China is a huge consumer market that accounted for a third of global economic growthover the past three years、 Its development speed and potential cannot be ignored by the restof the world、 As a result of China’s internal and external economic attributes, most of the、 In particular in the automobileglobal consumer brands have established operations thereindustry, many of the leading global OEMs including Honda, Toyota, General Motors, Volkswagen and Ford have established joint-venture partnerships with local car manufacturers、 Auto sales in China rose by 76% in the year to July 2003 and by 2011,、 InChina is expected to surpass Japan to become the wor ld’s second largest auto marketorder to compete in the Chinese market share and satisfy increasing demand, these operations are continuously expanding their production volumes with astonishing speed、Such expansion is, however carried out in the context of a legacy environment、China spans a large geographical area with, in many parts, under-developed infrastructure、 This presents a challenge to efficient deployment of logistics strategies、Furthermore, the involvement of third party logistics providers, favoured by most globalOEMs, is an emergent consideration in China、 Finally, the conflicts that inevitably arise inthe joint venture partnerships lead to delays in the introduction of western logistics management e xperiences and methods from the OEMs、All these factors increase the、difficulties in managing logistics by China’s local auto makers2、 The overall development of foreign distribution Overview2、1 The United States of modern logistics developmentTwenty-first century from the 60s on wards, the rationalization of distribution of goodsin general are valued in the United States to take the following measures: First, the warehouse will replace the old distribution center: The second is the management of the introduction of computer networks, on the loading and unloading, handling, custody, standardized operation, improve operating efficiency; Third, the common chain distribution centers set up to promote the growth of chain-effective、 United States chain stores have a variety of distribution centers, mainly in the wholesale-based, r etail and warehouse-type three types、2、2 Japan's modern logistics developmentOn logistics and distribution of wood with the following features: well-developed distribution channels, frequent, low-volume stock, logistics and distribution reflects the common and set the trend sticks, logistics and distribution cooperative, the Government planning in the development of modern logistics and distribution play an important role inthe process of 、2、3 European modern development of logisticsCountries in Europe, especially Germany, logistics refers to the user's orders in accordance with the requirements of positions in the logistics sub-goods distribution, the goods will be sent to the consignee with good activities、Germany's logistics industry formed of basic commodities from origin to distribution center, from the distribution center (and sometimes through more than one distribution center) arrive at the modern mode of end customers、 Traveled in Germany, it can be said of the logistics and distribution in Germany has been formed to final demand-oriented to the modernization of transport and high-techinformation network as a bridge to a reasonable R69 distribution center hub to run a complete system、2、4 the main reasons of logistics industry developing faster in developed countriesRelying on high-tech to the core economies of scale to allow flexibility based on a variety of forms、3、China's 3PL enterprises are facing a major obstacle to business3、1 The current situation of China's 3PLChina's 3PL enterprises: service radius of a small, low entry barriers、 With the gradual warming heat logistics, urban logistics industry is also increasingly unitary covered by the importance and development、However, due to historical reasons in our country, the long-standing emphasis on production of a light flow, heavy flow to light the idea of the logistics, distribution of development in the not yet ripe at this stage, there is the issue more prominent in the following two aspects: the service delivery difficult to play a central role,the process of distribution of the low level of modernization、China's 3PL companies with foreign 3PL companies mainly in the gap between the three aspects: First, procurement capacity, and the other is logistics, and the third is cash flow、Aspects of logistics and distribution, foreign retailers have done very well, has a set of efficient logistics information system, which can effectively improve the inventory turnover rate, so as to enhance the return on assets and profitability、 And domestic retailers in this、area has just started, or have not yet started3、2 distribution center lower the overall distribution, commercial chain failed to give full play to the advantagesFrom our point of view the existing commercial retail enterprises, in addition to some large, well-known commercial enterprises, the general commercial "chain" businesses are not set up their own logistics and distribution centers or use third-party logistics center、Although these companies have also established some of his own "chain" stores, but in fact operating goods stores do not do "unified procurement, unified distribution, unified billing,"、 The which allows some commercial retail enterprises, "chain" seems to exist in name onlyother has been established in their own logistics and distribution centers or use third-party logistics distribution center of commodities in commercial enterprises, the effectiveness of distribution centers has not been effective, which in turn affected the procurement cost of an integrated chain advantages, including outstanding manifested by the distribution center for goods distribution ratio of unity is very low、 Uniform distribution logistics center can notbe achieved, indicating the store's commercial enterprises "unified purchase" did not、materialize, rather than a unified procurement chain has lost the core strengths3、3 China's more enterprises are facing a major obstacle of the higher logistics costWal-Mart 8 5% of the commodities distribution through the distribution center, in which 80% is through the "zero inventory" of the more complete form of the distribution database、Wal-Mart as a result of the use of the "Cross distribution" and "auto-replenishment" of supply chain technology, so that goods turnover in the Treasury down to 2 days、 And retail enterprises in China are in the 15-30 days, which reflects the retail , distribution enterprises, underdeveloped logistics system, distribution costs are too high、 Rapid expansion of retail enterprises in China's size and speed in the short term if they can not form a qualitative edge is a dangerous speculation、Over the years the practice has proved that the multi-purpose logistics distribution center, intensive, low-cost supply hub, as well as the use of information technology to reorganize and upgrade the entire flow of the supply chain management is the core of large-scale retail enterprises strategy is to support the retail giant super-conventional development、The face of large-scale retail and distribution businesses o f the main distribution center logistics requirements planning, focusing on how to reflect the integration of information flow in business flow, logistics, capital flow, so that the operation of retail enterprises to expand the logistics for the entire enterprise supply chain collaboration nodes and so that the whole positive and negative to minimize logistics cost of goods (including consumers, stores, logistics, distribution centers, headquarters, suppliers and partners), and a timely response t o sales demand and timely replenishment、This is also a large-scalecross-regional, multi-format, chain retail enterprises have the capacity of the core competitive advantage、3、4 Lack of modern logistics management knowledge and expertise of logistics personnel、This is the third-party logistics industry in restricting the development of China's most important one of the bottlenecks、Logistics knowledge, especially in modern integrated third party logistics knowledge is far from being universal, but that its main business areas is to provide transportation and warehousing services, not know that it is new to these traditional business integration of its business fields Far too simple to become connected with transport and storage of raw materials, semi-finished products supply, production process, material flow, the whole process of product distribution services, as cover flow, solid logistics, capital flow, information flow is equal to the integrated systemof systems、4 to enhance core competitiveness, the implementation of integrated management"integrated management" is the original English Integrated SupplyProcess, refers to the production enterprises, office, life of a non-core business areas of the operation and management of integration as a Overall, as a business-oriented t o manage outsourcing projects, by the special "integrated management" of the suppliers to provide full-service projects、"Integrated management" is not simply puts together the management of the business, but to improve management efficiency and reduce management costs as the core, combined with advanced information technology and network management features such as one organically integrated、Compared with the general outsourcing services, integrated management has the following characteristics:(1) It is not a business, but a complete outsourcing business from the operation of themanagement integration of outsourcing;(2) Outsourcing is not a core operation, but a comprehensive business management、Responsible for the entire business as a first-class suppliers, and its main task is to use its unique resources to conduct a comprehensive knowledge management, the operation of the specific is it managed by the secondary and tertiary suppliers to implement, so in themanagement of outsourcing functions based on the specific operation of the outsourcing; (3) In the case of the most important first-level suppliers, other than remuneration in thefixed service, its the only way to increase revenue for users to save costs as much as possible in order to share the proceeds of cost savings, rather than as general outsourcing as suppliers, mainly through an increase in turnover, that is, to increase spending to increase the user's own earnings、 "Double bottom" principle of cooperation between the two sides can make a stable and lasting、5 The third party logistics enterprise strategic choiceSummarized the latest of several foreign logistics theory and the development ofthird-party logistics with the current practice of foreign, third-party logistics firm's strategic choice to have the following three:(1)Lean Logistics StrategySince the lag theory and practice of logistics, our most extensive third-party logistics company or business, it can not accurately position their logistics services、 If you do not reverse this situation as soon as possible, will be third-party logistics industry in China have restricted role、 Lean production theory of logistics for our third-party logistics company provides a new development ideas for these enterprises to survive in the new economy and development opportunities、 Lean Logistics concept originated in lean manufacturing、 Itis produced from the Toyota Motor Corporation 70 years in the last century by the original "Toyota Production System", after research by the Massachusetts Institute of Technology professor and summary, was published in 1990 published "change the world of machines), a book、 Lean thinking is the use of various modern management methods and means, based on the needs of society to fully play the role of people as a fundamental and effective allocation and rational use of corporate resources to maximize economic benefits for enterprises to seek a new Management philosophy、 Lean Logistics Lean Thinking is the application in logistics management, logistics development must reflect、The so-called Lean Logistics means: the process by eliminating the production and supply of non-value added waste in order to reduce stocking time, improve customer satisfaction、 The aim ofLean Logistics according to customer needs, providing customers with logistics services, while pursuing the provision of logistics services in the process to minimize waste and delay, the process of increasing value added logistics services、Lean logistics system is characterized by its high-quality, low cost, continuous improvement, driven by customer demand oriented logistics system、 It requires establishing the customer first thought, on time, accurate and fast delivery of goods and information、In short, Lean Logistics, as a new management ideas, bound to have a third-party logistics enterprises in China have far-reaching impact, it will change the appearance of the extensive third party logistics management concept, the formation of third party logistics Core competitiveness、the establishment of small and medium third party logistics value chain allianceThird-party logistics enterprises of small and medium can not be independent because of their one-stop logistics services to provide full shortcomings, and because the small size of assets, services, not wide area so that small and medium enterprises in China's logistics third party logistics industry at a disadvantage、 Therefore, third party logistics for small and medium enterprises, starting from their own resources to construct their own core competence is the key、 As small and medium enterprise features of a single third-party logistics and incomplete, so based on their respective core competencies based on the structure of the logistics business enterprise cooperation is an effective capacity to make up for deficiencies, constitutes a feasible way of competitive advantage of logistics、 Value chain is the use of systems approach to investigate the interaction between business and the、 Value analysis of all activities and their access to the resources of competitive advantageof the business activities fall into two categories: basic activities and support activities、Basic activities are involved in product creation and sale of the material transferred to the buyer and after-sales service activities、 Basic activities of supporting activities is to assistthe revenue by providing outsourcing, technology, human resources and a variety of functions to support each other、 Theory to analyze the value chain study the value of third party logistics chain composition, can be found in auxiliary activities, third party logisticsenterprise and general business is no different, the basic activities in the third-party logistics companies has its own characteristics、 Third-party logistics enterprises there is generally no commodity production process, only the re-circulation process, d oes not account for major components of a wide range of third-party logistics companies and thus become the basic operating activities of storage, transport, packaging, distribution, customer service and marketing, etc、 link、 Various aspects of the basic work activities, due to their own limited resources and capacity, can not have every aspect of an advantage in that value chain in terms of some of the deficiencies, resulting in their overall logistics function not complete, lack of corresponding competitiveness and comparative advantage in some sectors of the value chain due to lack of overall effect should not play、 Therefore, third party logistics industry, small and medium sized logistics enterprises within the Union, should be based on the value chain between complementary on the basis of cooperation, make full use of professional logistics companies and logistics functions of specialized logistics organization and coordination of agents Flexible complementary integrated logistics capabilities、Third-party logistics for small and medium enterprises, value chain should start with the advantage of links to explore and develop the core competitiveness of enterprises, through the reconstruction of the value chain to avoid weaknesses、(2)Large third-party logistics enterprise virtualization of strategyRapid development in IT and the Internet era, companies can not fight alone singles, but must be in the competition and collaboration, in cooperation and development、Thus, under modern conditions resulting from modern large-scale virtualized development of third-party logistics has a strong necessity、Large third-party logistics enterprise virtualization is the logistics management resources of others who will have "all", through the network, the other part into its own logistics, with the help of others break the power of physical boundaries, extending to achieve their various Function, and thus expand their ability to enhance their strength、Therefore, the logistics information technology, virtualization is a means for the connection and coordination of temporary and dynamic alliance in the form of virtual logistics、 Integrated logistics virtualization technology as ameans of electronic communication, customer-focused, based on the opportunity to participate in members of the core competencies as a condition to an agreement for the common pursuit of goals and tasks, the different parts of the country's existing Resources to quickly mix into a no walls, beyond the space constraints, by means of electronic networks, contact the unified command of the virtual business entity, the fastest launch of high-quality, low-cost logistics service、Modern large-scale virtualization, including third-party logistics functions, organization, geographic three virtualization、Virtualization capabilities with third-party logistics enterprise IT technology will be distributed in different locations, different companies take different functions within the logistics resources (information, human, material and other resources) organized to accomplish a specific task, to achieve the optimization of social resources、 Virtualization refers to the organizational structure of the logistics organization is always dynamically adjusted, not fixed, but also decentralized, flexible, self-management, flat network structure, its objectives and in accordance with changes in the environmentre-combination, in a timely manner Reflect the market dynamics、 Virtual is the regional third party logistics network through the Internet link the global logistics resources, removing barriers and national barriers, to production management to achieve "virtual neighbors、 "1 导言物流通常被认为就是将恰当的产品以最低的成本,在恰当的时间送达恰当的地点。

交通运输交通系统中英文对照外文翻译文献

中英文对照外文翻译文献(文档含英文原文和中文翻译)译文：交通系统交通运输一直是土木工程最重要的一个方面。

古罗马工程师的巨大成就之一就是公路系统，它使罗马与帝国的各个省之间的快速交通成为可能。

在工程方面的第一所培训学校就是桥梁和公路学校，它于1747年创建于法国。

而在英国，一位道路建筑家，托马斯·泰尔福特于1820年担任了土木工程学会的第一任主席。

现代公路仍然根据18世纪及19世纪初法国人皮埃尔·特埃萨凯，英国人泰尔福特，以及苏格兰人约翰·L·马克当所制定的原则进行建造。

这些人设计出了最初的现代道路，这种道路具有坚实的垫层，基础就建在垫层的上面。

他们设计的道路还具有排水良好而且不渗水的磨耗层，即直接承受车辆交通磨耗的表层。

特埃萨凯和泰尔福特均采用较厚的石头基础，在其上面铺筑由较小碎石组成的基层和由更小的石头组成的磨耗层。

他们的道路还微微隆起成曲线，形成路拱和反拱以便使雨水流走。

马克当认识到当土壤被夯实或压紧之后，只要保证干燥，其本身就可承受道路的重量，因而他能够通过在压实的垫层上铺碎石基层来省掉建造石头基础所需要的昂贵费用。

当时车辆的铁质车轮把表层石头碾压成连续的，较为平整的，更加不透水的表面。

早19世纪，货车和客车都采用铁或钢制车轮，这种道路是适用的。

当汽车在20世纪初出现之后，其橡胶轮胎毁坏了这种平整的路面。

因此，就采用焦油或沥青掺拌碎石，使路面表层更坚固的黏合一起。

现在，遍布全世界的数百万公里的道路采用这种路面。

在20世纪，道路建设基本上仅在两方面进行了改进。

第一种改进是采用混凝土作为磨耗层。

另一种改进则是交通工程，即设计高速的大交通量的、造价经济并且对于车辆和旅客都安全的公路。

交通工程已建成了现代高速公路，这种公路具有限定的入口和最安全的管理。

老式道路常用的拐角形交叉已不使用，而采用互通式立体交叉或其他更为复杂的设计。

现代高速公路通常设有专门的车道，在那里当车辆要驶出公路时可减速驶入时可加速。

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交通事故分析的可能性和局限性S.Oppe关键字：后果;目的;描述;限制;关注;事故分析;可能性摘要：交通事故的统计数字，尤其国家一级的数据对监控和预测事故的发展，积极或消极检测事故的发展，以及对定义安全目标和评估工业安全特别有益。

事故分析是应用非常有限的分析，是前瞻性分析和回顾性分析，能够对新开发的交通安全系统和特殊过程的安全措施进行评价。

目前迫切需要一个将实时事故分析与研究相结合的行为。

将自动检测和视频录制相结合的研究交通事故的科研论文会比较容易接受。

这种类型的研究最终会对交通理念有个完善的认识。

1．简介本文主要是基于个人的经验，研究有关交通安全、安全分析以及事故分析等在研究中的作用。

由这些经验推导出的哲学思考就像通过研究和统计得出的实践观点。

而这些调查数字已经在其他地方发表了。

在缺少直接观察的事故中，许多方法论问题的产生，导致不能直接测试对结果持续讨论。

通过看事故视频来讨论是富有成效的。

事实证明，用来解释事故的大部分有关信息就是事故中缺少的记录。

深入研究还无法回忆起所有的必要的用来测试有关事故发生的假设数据，。

尤其是车-车相撞发生的车祸，这是在荷兰城市道路交叉口录制的视频，一辆从岔路驶来的汽车与主干路的汽车相撞，下列问题可以问：为什么汽车来自次干路上，突然加速后又几乎停止，撞上了在左侧主路的一辆汽车呢？为什么没有注意到正在驶来的车？是不是因为两车从右边驶来，司机因为前面的交叉为他们提供了可能性而斤斤计较？难道他向左看过，但他认为停在拐角处的绿色货车能让他停下来？当然，交通状况并不复杂。

目前这个事故中没有骑自行车或行人在拥挤路口分散他的注意。

如果停着的绿色车能够在五分钟内消失，这两辆车可能就不会相撞。

在事故发生的相关条件下，几乎不可能观察下一个交通行为，因为交通事故是不可预见的。

由于新的视频设备和自动检测事故设备的不断发展，如在收集数据方面不需要很高的成本就能变得越来越逼真。

必要的增加数据类型也能更好的解释交通中存在的危险因素。

关于事故分析的可能性和限制性的问题是不容易回答的，我们不能确切的分析交通事故。

因为事故分析涵盖了每一个活动中的不同背景，并根据不同的信息来源范围来补充资料，特别是收集事故的数据，背景资料等，我们首先要看看在交通安全领域的活动周期然后再回答事故分析的可能性与限制。

这些行为主要是与交通系统的安全管理有关，有些则是相关的研究活动。

应该用下面的步骤来加以区分：——检测交通安全问题；——描述问题和它的主要特征；——分析其原因分析和改进建议；——选择和执行安全措施；——评价所采取的措施。

虽然这个周期可以由同一人或一群人做出来，而问题在每个阶段（政治/管理或科学）都有不同的背景。

我们用事故分析来描述这一阶段。

做这个决定是重要的。

很多关于分析结果的方法的讨论由于忽视之间的区别而成为徒劳的。

政治家或道路管理人员对道路的个别事故不是很留意。

他们对事故的看法往往都是一视同仁，因为总的结果比整个事故中的每个人的因素重要。

因此，每次事故看做一个个体，之间相互协调就会达成安全的结果。

研究人员研究事故发生时一连串事件中每个人的兴趣。

希望从中得到关于每次事故的详细信息并能发现其发生的原因和有关的条件。

政治家们希望只是因为细节决定行动。

在最高一级事故总数减少。

信息的主要来源是国家数据库及其统计学处理系统。

对他来说，统计意外数字及其统计的波动来进行事故分析。

这适用于事故分析中的交通安全领域。

因此，我们将首先描述了事故的这些方面。

2．事故的性质和它们的统计特性事故基本概念是意外，不管是其发生的原因还是引起事故出现的过程。

两个简单的假设通常是来描述交通事故的形成过程：-事故发生的概率与以往发生的事故之间是独立；-事故发生在时间上是同性质的如果这两个假设成立，那么事故是泊松分布。

第一个假设与大多数的批判不符。

事故是罕见的事件，因此不会受到以前事故的影响。

在某些情况下，有一个直接的因果链（例如，大量的车开到一起）这一系列的事故被认为是一个个体事故但包含许多的车。

这个假设并不适用于统计人员伤亡。

伤亡人数往往与同一事故有关，因此，独立性假设不成立。

第二个假设乍一看似乎不太容易理解。

穿越空间或在不同地点发生的的事故同样具有可能性。

然而，假设需要很长一段时间并且没有缓缴期。

其性质是根据理论的假设。

如果其短时间内能成立，那么它也适用于长时间，因为泊松分布变量的总和，即使他们的泊松率是不同的，但也属于泊松分布。

对于这些时期的总和泊松率则等于为这些地方的泊松率的总和。

假设与一个真正的情况相比较计数，无论是从一两个结果还是总情况来看都有一个基本情况比较符合。

例如，对比在一年中特定的一天例如下一天，下一个星期的一天发生的交通事故。

如果条件是相同的（同一时间，交通情况相同，同样的天气条件等），那么由此产生的意外数字是相同的泊松过程的结果。

这一假设可以通过估算进行测试的两个观测值的基础上（估计是两个值的平均值）的速度参数。

概率理论能够考虑到这两个观察值的平均，用于计算的平等假设的可能性。

这是一个相当强大的统计过程。

泊松假设是研究了很多次，来获得证据支持。

它已经应用于许多情况，数的差异表明在安全性的差异然后确定是否发生意外。

这一程序的主要目的是检测在安全分歧。

这可能是一个时间上的差异，或不同的地方或不同的条件。

这种差异可以指导改进的过程。

由于主要关注的是，以减少意外的发生，这种分析可能导致对治疗中最有前途的领域。

为这样一个测试应用程序的必要条件是，那意外的数字进行比较是大到足以证明存在的分歧。

在许多地方情况下，一个应用程序是不可能的。

事故黑点分析往往阻碍了这一限制，例如，如果应用这种测试，找出事故是否在特定的位置数是高于平均水平。

该程序的描述，也可以使用，如果发生意外乃根据数的特点找到有前途的安全目标。

不仅聚集，而且还与分类泊松假设成立，而意外数字可以相互测试的泊松假设的基础。

这种测试是相当麻烦的，因为每个特定的情况下，每一个不同的泊松参数，即，对所有可能结果的概率必须计算应用测试。

然后，泊松分布近似为正态分布，均值和方差等于泊松参数。

一旦均值和方差的正态分布，给出了所有的测试可以改写了标准零均值和方差的正态分布条件。

没有任何更多的必要计算，但测试统计，需要利用表绘制。

3. 行车安全政策事故统计的应用分析那些假设的基础上描述的测试程序的类型及其优点。

这种应用最好的例子是为一个国家或地区进行超过一年的安全监测，用事故的总体数据（最终的特定类型，如死亡事故）与前几年的数据相比较。

根据数年的事故序列，能够分析出它的发展趋势，并大致预测以后几年的事故数量。

一旦建立了这样一种趋势，那么在误差范围内未来一年或几年都可以预见。

从一个给定趋势的偏差也可以进行预测新的事件。

最有名的是斯米德在1949年进行的分析。

我们将讨论这个事故类型分析更详细的内容。

1、该测试应用推广到高阶分类。

Foldvary和Lane（1974），在衡量强制佩戴安全带的效果，谁是最早应用于值的4路表高阶相互作用的总卡方分配的。

2、测试不局限于总体影响，但卡方值就可以分解模型内子假说。

另外，在双向表，卡方总可以分解成零件表互动的作用。

对1的优势。

和2。

比以前的情况是，这对许多相互关联的（子）表和相应的智广场卡方检验是由大量分析，取而代之的是一个一卡方的确切划分。

3、投入更多关注的是参数估计。

例如，在卡方分割使人们有可能以测试有关行参数的线性或二次限制或趋势的不连续性。

4、分析的单位是从数到广义加权计数。

这对于道路安全分析，那里一段时间，道路使用者的数量，地点或公里数的车辆往往是必要的修正有利。

最后一个选项是没有发现在许多统计软件包。

安徒生1977年给出了一个用于道路双向安全分析表的例子。

工资保障运动的一个计算机程序。

这一级没有说明事故原因分析。

它会尝试检测安全问题需要特别注意。

所需的基本信息包括事故数字，来形容不安全总额，暴露的数据来计算风险，并找到一个高风险的情况下或（团体）道路使用者。

4. 事故分析研究目的交通安全的研究是有关的事故及其后果的发生。

因此，人们可能会说，研究对象是意外。

然而研究人员的兴趣较少集中在这个最后的结果本身，而是多在进程更多的结果（或不结果）的事故。

因此，最好是把作为他的研究对象，在流量的重要事件。

一个在交通意外的过程，结果是，该实际发生是由研究者未落观测研究的主要问题。

调查一宗交通意外，他将努力重建了间接来源的事件，如涉及的道路使用者，所提供的资料或目击者有关情况，车辆，道路和司机的特点。

因此这不是科学独特的，也有一个间接的研究对象的研究更多的例子。

但是，第二个困难是，该研究的对象不能被诱发。

有系统的控制实验手段研究只对问题方面的可能，而不是问题本身。

间接观察和缺乏系统的控制组合使调查人员很难发现在什么情况下造成事故的因素。

虽然研究人员主要是在事故处理领导有兴趣，他几乎完全信息的后果，它的产品，意外。

此外，事故背景是复杂的。

一般来说，可分为以下几个方面：-考虑到交通系统，交通量和组成国家，道路使用者，他们的速度，天气条件下，路面情况，车辆，道路使用者和他们的相互作用的演习，意外可以或无法预防。

-由于发生事故，也对这样的速度和车辆质量的因素，大量的不同，碰撞角度，对道路使用者和他们的脆弱性，影响等位置的保护，伤害是严重或或多或少物质损失是多还是少可观。

虽然这些方面不能独立研究从理论的角度看，它也从由此产生的结果的优势，区分交通情况有潜在危险的数字，是由有一个意外的可能性，在这种潜在的危险局势，给定一个特定事故。

这个概念框架是对风险的关于个别道路使用者，以及上级的决定控制器的决定制定的一般基础。

在风险的数学公式，我们需要一个明确的概率空间的介绍，基本事件（的情况），可能导致事故组成，每个类型的事件的概率，最终收在一次事故中，最后的具体成果，损失，鉴于事故的类型。

另一种方法是看事故特征组合，然后找出关键因素。

这种类型的事故分析是通过分析事故的共组或子群来开展。

事故本身是一个研究的单位，但也要研究道路因素：道路位置，道路设计（如一个弯道）等。

原文出处：SWOV institute for road safety research Leidschendam（会议记录），记录者，S.Oppe.POSSIBILITIES AND LIMITATIONS OF ACCIDENTANALYSISS.OppeKeyword：Consequences; purposes; describe; Limitations; concerned; Accident Analysis; possibilitiesAbstraet：Accident statistics, especially collected at a national level are particularly useful for the description, monitoring and prognosis of accident developments, the detection of positive and negative safety developments, the definition of safety targets and the (product) evaluation of long term and large scale safety measures. The application of accident analysis is strongly limited for problem analysis, prospective and retrospective safety analysis on newly developed traffic systems or safety measures, as well as for (process) evaluation of special short term and small scale safety measures. There is an urgent need for the analysis of accidents in real time, in combination with background behavioural research. Automatic incident detection, combined with video recording of accidents may soon result in financially acceptable research. This type of research may eventually lead to a better understanding of the concept of risk in traffic and to well-established theories.1. Introduction.This paper is primarily based on personal experience concerning traffic safety, safety research and the role of accidents analysis in this research. These experiences resulted in rather philosophical opinions as well as more practical viewpoints on research methodology and statistical analysis. A number of these findings are published already elsewhere.From this lack of direct observation of accidents, a number of methodological problems arise, leading to continuous discussions about the interpretation of findings that cannot be tested directly. For a fruitful discussion of these methodological problems it is very informative to look at a real accident on video. It then turns out that most of the relevant information used to explain the accident will be missing in the accident record. In-depth studies also cannot recollect all the data that is necessary in order to test hypotheses about the occurrence of the accident.For a particular car-car accident, that was recorded on video at an urban intersection in the Netherlands, between a car coming from a minor road, colliding with a car on the major road, the following questions could be asked:Why did the driver of the car coming from the minor road, suddenly accelerate after coming almost to a stop and hit the side of the car from the left at the main road? Why was the approaching car not noticed? Was it because the driver was preoccupied with the two cars coming from the right and the gap before them that offered him the possibility to cross? Did he look left before, but was his view possibly blocked by the green van parked at the corner? Certainly the traffic situation was not complicated. At the moment of the accident there were nobicyclists or pedestrians present to distract his attention at the regularly overcrowded intersection. The parked green van disappeared within five minutes, the two other cars that may have been important left without a trace. It is hardly possible to observe traffic behaviour under the most relevant condition of an accident occurring, because accidents are very rare events, given the large number of trips. Given the new video equipment and the recent developments in automatic incident and accident detection, it becomes more and more realistic to collect such data at not too high costs. Additional to this type of data that is most essential for a good understanding of the risk increasing factors in traffic, it also important to look at normal traffic behaviour as a reference base. The question about the possibilities and limitations of accident analysis is not lightly answered. We cannot speak unambiguously about accident analysis. Accident analysis covers a whole range of activities, each originating from a different background and based on different sources of information: national data banks, additional information from other sources, specially collected accident data, behavioural background data etc. To answer the question about the possibilities and limitations, we first have to look at the cycle of activities in the area of traffic safety. Some of these activities are mainly concerned with the safety management of the traffic system, some others are primarily research activities.The following steps should be distinguished:- detection of new or remaining safety problems;- description of the problem and its main characteristics;- the analysis of the problem, its causes and suggestions for improvement;- selection and implementation of safety measures;- evaluation of measures taken.Although this cycle can be carried out by the same person or group of persons, the problem has a different (political/managerial or scientific) background at each stage. We will describe the phases in which accident analysis is used. It is important to make this distinction. Many fruitless discussions about the method of analysis result from ignoring this distinction. Politicians, or road managers are not primarily interested in individual accidents. From their perspective accidents are often treated equally, because the total outcome is much more important than the whole chain of events leading to each individual accident. Therefore, each accident counts as one and they add up all together to a final safety result.Researchers are much more interested in the chain of events leading to an individual accident. They want to get detailed information about each accident, to detect its causes and the relevant conditions. The politician wants only those details that direct his actions. At the highest level this is the decrease in the total number of accidents. The main source of information is the national database and its statistical treatment. For him, accident analysis is looking at (subgroups of)accident numbers and their statistical fluctuations. This is the main stream of accident analysis as applied in the area of traffic safety. Therefore, we will first describe these aspects of accidents. 2. The nature of accidents and their statistical characteristics.The basic notion is that accidents, whatever there cause, appear according to a chance process. Two simple assumptions are usually made to describe this process for (traffic) accidents:- the probability of an accident to occur is independent from the occurrence of previous accidents;-the occurrence of accidents is homogeneous in time.If these two assumptions hold, then accidents are Poisson distributed. The first assumption does not meet much criticism. Accidents are rare events and therefore not easily influenced by previous accidents. In some cases where there is a direct causal chain (e.g. , when a number of cars run into each other) the series of accidents may be regarded as one complicated accident with many cars involved.The assumption does not apply to casualties. Casualties are often related to the same accident and therefore the independency assumption does not hold. The second assumption seems less obvious at first sight. The occurrence of accidents through time or on different locations are not equally likely. However, the assumption need not hold over long time periods. It is a rather theoretical assumption in its nature. If it holds for short periods of time, then it also holds for long periods, because the sum of Poisson distributed variables, even if their Poisson rates are different, is also Poisson distributed. The Poisson rate for the sum of these periods is then equal to the sum of the Poisson rates for these parts.The assumption that really counts for a comparison of (composite) situations, is whether two outcomes from an aggregation of situations in time and/or space, have a comparable mix of basic situations. E.g. , the comparison of the number of accidents on one particular day of the year, as compared to another day (the next day, or the same day of the next week etc.). If the conditions are assumed to be the same (same duration, same mix of traffic and situations, same weather conditions etc.) then the resulting numbers of accidents are the outcomes of the same Poisson process. This assumption can be tested by estimating the rate parameter on the basis of the two observed values (the estimate being the average of the two values). Probability theory can be used to compute the likelihood of the equality assumption, given the two observations and their mean. This statistical procedure is rather powerful. The Poisson assumption is investigated many times and turns out to be supported by a vast body of empirical evidence. It has been applied in numerous situations to find out whether differences in observed numbers of accidents suggest real differences in safety. The main purpose of this procedure is to detect differences in safety. This may be a difference over time, or between different places or between different conditions. Such differences may guide the process of improvement. Because the main concern is to reduce thenumber of accidents, such an analysis may lead to the most promising areas for treatment. A necessary condition for the application of such a test is, that the numbers of accidents to be compared are large enough to show existing differences. In many local cases an application is not possible. Accident black-spot analysis is often hindered by this limitation, e.g., if such a test is applied to find out whether the number of accidents at a particular location is higher than average. The procedure described can also be used if the accidents are classified according to a number of characteristics to find promising safety targets. Not only with aggregation, but also with disaggregation the Poisson assumption holds, and the accident numbers can be tested against each other on the basis of the Poisson assumptions. Such a test is rather cumbersome, because for each particular case, i.e. for each different Poisson parameter, the probabilities for all possible outcomes must be computed to apply the test. In practice, this is not necessary when the numbers are large. Then the Poisson distribution can be approximated by a Normal distribution, with mean and variance equal to the Poisson parameter. Once the mean value and the variance of a Normal distribution are given, all tests can be rephrased in terms of the standard Normal distribution with zero mean and variance one. No computations are necessary any more, but test statistics can be drawn from tables.3. The use of accident statistics for traffic safety policy.The testing procedure described has its merits for those types of analysis that are based on the assumptions mentioned. The best example of such an application is the monitoring of safety for a country or region over a year, using the total number of accidents (eventually of a particular type, such as fatal accidents), in order to compare this number with the outcome of the year before. If sequences of accidents are given over several years, then trends in the developments can be detected and accident numbers predicted for following years. Once such a trend is established, then the value for the next year or years can be predicted, together with its error bounds. Deviations from a given trend can also be tested afterwards, and new actions planned. The most famous one is carried out by Smeed 1949. We will discuss this type of accident analysis in more detail later.1. The application of the Chi-square test for interaction is generalised to higher order classifications. Foldvary and Lane (1974), in measuring the effect of compulsory wearing of seat belts, were among the first who applied the partitioning of the total Chi-square in values for the higher order interactions of four-way tables.2. Tests are not restricted to overall effects, but Chi-square values can be decomposed regarding sub-hypotheses within the model. Also in the two-way table, the total Chisquare can be decomposed into interaction effects of part tables. The advantage of 1. and 2. over previous situations is, that large numbers of Chi-square tests on many interrelated (sub)tables andcorresponding Chi-squares were replaced by one analysis with an exact portioning of oneChi-square.3. More attention is put to parameter estimation. E.g., the partitioning of the Chi-square made it possible to test for linear or quadratic restraints on the row-parameters or for discontinuities in trends.4. The unit of analysis is generalised from counts to weighted counts. This is especially advantageous for road safety analyses, where corrections for period of time, number of road users, number of locations or number of vehicle kilometres is often necessary. The last option is not found in many statistical packages. Andersen 1977 gives an example for road safety analysis in a two-way table. A computer programme WPM, developed for this type of analysis of multi-way tables, is available at SWOV (see: De Leeuw and Oppe 1976). The accident analysis at this level is not explanatory. It tries to detect safety problems that need special attention. The basic information needed consists of accident numbers, to describe the total amount of unsafety, and exposure data to calculate risks and to find situations or (groups of) road users with a high level of risk.4. Accident analysis for research purposes.Traffic safety research is concerned with the occurrence of accidents and their consequences. Therefore, one might say that the object of research is the accident. The researchers interest however is less focused at this final outcome itself, but much more at the process that results (or does not result) in accidents. Therefore, it is better to regard the critical event in traffic as his object of study. One of the major problems in the study of the traffic process that results in accidents is, that the actual occurrence is hardly ever observed by the researcher.Investigating a traffic accident, he will try to reconstruct the event from indirect sources such as the information given by the road users involved, or by eye-witnesses, about the circumstances, the characteristics of the vehicles, the road and the drivers. As such this is not unique in science, there are more examples of an indirect study of the object of research. However, a second difficulty is, that the object of research cannot be evoked. Systematic research by means of controlled experiments is only possible for aspects of the problem, not for the problem itself.The combination of indirect observation and lack of systematic control make it very difficult for the investigator to detect which factors, under what circumstances cause an accident. Although the researcher is primarily interested in the process leading to accidents, he has almost exclusively information about the consequences, the product of it, the accident. Furthermore, the context of accidents is complicated. Generally speaking, the following aspects can be distinguished:- Given the state of the traffic system, traffic volume and composition, the manoeuvres of the road users, their speeds, the weather conditions, the condition of the road, the vehicles, the road usersand their interactions, accidents can or cannot be prevented.- Given an accident, also depending on a large number of factors, such as the speed and mass of vehicles, the collision angle, the protection of road users and their vulnerability, the location of impact etc., injuries are more or less severe or the material damage is more or less substantial. Although these aspects cannot be studied independently, from a theoretical point of view it has advantages to distinguish the number of situations in traffic that are potentially dangerous, from the probability of having an accident given such a potentially dangerous situation and also from the resulting outcome, given a particular accident.This conceptual framework is the general basis for the formulation of risk regarding the decisions of individual road users as well as the decisions of controllers at higher levels. In the mathematical formulation of risk we need an explicit description of our probability space, consisting of the elementary events (the situations) that may result in accidents, the probability for each type of event to end up in an accident, and finally the particular outcome, the loss, given that type of accident.A different approach is to look at combinations of accident characteristics, to find critical factors. This type of analysis may be carried out at the total group of accidents or at subgroups. The accident itself may be the unit of research, but also a road, a road location, a road design (e.g.a roundabout) etc.。