Journal of Transportation Systems Engineering and Information Technology

“12th Five-Year” Development Program for Integrated Transportation in Shenzhen

ZHANG Guo-wu

2011, 11(1): 2-12 .

Abstract ( )

The society and economy have developed rapidly and continuously since Shenzhen Special Economic Zone set up, in which integrated transportation system played an important supporting role to fulfill the leaping development. The 21th Conference of “Traffic and Transportation 7+1 Forum” sets its theme as “future development of “12th Five-Year” integrated transportation in Shenzhen”. It recalls the development of integrated transportation of the “11th Five-Year” in Shenzhen, and analyzes the development trend and demand forecasts of future traffic. On the basis, development goal and development strategy of “12th Five-Year” integrated transportation in Shenzhen are cleared, development distribution and activity policy of integrated transportation are proposed, coordinated implementation plan and guarantee mechanism are researched, project coordinated implementation database is established. It lays a foundation for the “12th Five-Year” integrated transportation in Shenzhen.

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The Research Framework of Integrated Transportation Planning Based on Transportation Demand

WU Qun-qi,LI Zhao-lei

2011, 11(1): 13-19 .

Abstract ( )

Based on the existing grave defects of integrated transportation planning theory and the premise of re-recognizing the transportation demand, the framework of integrated transportation planning research is established. This framework uses the transportation demand as the guidance. The resource and technology supply is treated as the constraint. Moreover, this paper tries to attain social and economic effectiveness maximization. Furthermore, the value movement is the logic thread. The new theory system has systematic innovation whether from theoretical point, or logic thread and evaluation standard. In additon, key variable selection and technical route are also the innovative point. It provides a new perspective and research approach for integrated transportation planning theory in new period

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Measurement of Highway Capital Stock in China: 1952-2009

DONG Jing, CEN Yan-qing

2011, 11(1): 20-23 .

Abstract ( )

Capital stock is one of the key indices for macroeconomic analysis and always is measured within the national wealth accounts. Although economists have gathered some experiences in the field of capital stock measurements, no one measures highway capital stock as an independent asset. Since 1998, large investments have formed into a huge public asset of the extensive highway system, and it contributed much to the economic development in China. Therefore, it is very necessary to measure the scale of highway system using this useful index. This study investigates several technical problems on measurement of highway capital stock based on the perpetual inventory method (PIM), adopts the disaggregated and weighted method to calculate the depreciation rate, and then measures the highway capital stock in China from 1952 to 2009. The findings and results may provide useful data to relevant research, and the proposed method can also be used for other fixed assets.

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A Review of Urban Passenger Transport Economic Management Policy

WANG Jian,HU Xiao-wei

2011, 11(1): 24-31 .

Abstract ( )

Urban passenger transport economic management policy is a critical approach of manager rational allocating passenger transport resources, which involves urban economic, social and environmental coordination development. From the perspective of urban passenger transport manager, this paper systematic review the research on urban passenger transport economic management policy objectives, decision-making methods, evaluation methods and urban passenger transport economic management policy simulation models. Finally discuss the research trends of urban passenger transport manager’s economic management policy in the future, and propose to build urban passenger transport economic management policy integration model, aiming at offering some valuable suggestions and references for urban passenger transport managers’ economic management policy making.

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Research on Integrated Transportation Channel Optimization of Southern Jiangsu Based on Virtual Rolling Optimization

WU Ming, FAN Dong-tao,LI Xu-hong

2011, 11(1): 32-37 .

Abstract ( )

As the rapid economic development, the contradiction between the rapidly increasing traffic demand in south of Jiangsu province and the limited land resource is getting more and more obvious. Under the circumstance, in order to play the overall efficiency of the integrated transportation system in south of Jiangsu, based on computing automatic controlling calculating strategy of rolling optimization method, virtual rolling optimization strategy is proposed for integrated transportation structural configuration. By dynamic procedure of rolling optimization, to guarantee the best configuration of transportation pattern and route flow. The balance between supply and demand to ensure the best structure configuration of integrated transportation. Using Shanghai-Nanjing corridor as an example, based on corridor development analysis and forecasting future traffic demand, to analyze the character of integrated transportation supply and demand, to propose structure optimization strategy. Research and discussion has been done for the basic ideas and strategy of integrated transportation corridor structural optimization, to provide some reference for building more reasonable integrated transportation network layout in south of Jiangsu province.

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Basic Content and Technical Framework of Computational Transport

LI Rui-min

2011, 11(1): 38-43 .

Abstract ( )

Research fields of transport engineering has been enlarged with the development of new traffic detectors and computational methods. Firstly, the conception of Computational Transport is introduced, as well as its objective, to understand the problems and phenomenon in transport field based on mass data with computational methods. Secondly the characteristics and components of Computational Transport are proposed, and two important bases are analyzed, the development of traffic detection techniques and computational tools for mass data. Then the technical framework of Computational Transport is analyzed in detail, and the application of some new computational techniques in transport is reviewed. As we can get more and more traffic detection data, Computational Transport will be an important support tool for the transport engineering research.

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Microscopic Simulation Model and Analysis on Waiting Area of Large Scale Railway Passenger Station

LI Ji-tao,FU Jia

2011, 11(1): 44-49 .

Abstract ( )

In order to accurately grasp the characteristics of passenger mustering and evacuation, estimate the passenger mustering capacity, a method of creating arrival passenger is presented from the microscopic simulation view based on distribution fitting to lead time of arrival passenger, the simulation logic model on waiting area of large scale railway passenger station is built. Taking the Dalian railway station for example, the variation curve of passengers in waiting area is plotted and the 95% confidence interval of maximum passenger mustering is ［3 638, 3 706］. The sensitivity analysis of influencing factors on variation of passengers in waiting area is performed based on the objective function of maximum assembling passenger. The simulation result showes that the location parameter of lognormal distribution has a significant effect on both the maximum assembling passenger and average waiting time in waiting area, the accompany rate has a significant effect on maximum assembling passenger and the management mode of check in has only a significant effect on average waiting time.

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Bus Lane Deployment Alternatives on Western 3rd Ring-Road Expressway in Beijing Based on INTEGRATION

ZHU Lin,YU Lei,ZHAO Na-le,GUO Ji-fu,WEN Hui-min

2011, 11(1): 50-55 .

Abstract ( )

Deploying bus lanes on urban expressways is considered as an important strategy to ease the traffic jam on expressways, which has received increased attention from the government agencies in Beijing. The primary objective of this paper is to use the advanced simulation approach to study the traffic impacts of bus lanes on urban expressways. In this paper, we select the western 3rd ring-road expressway as the study network, and design four bus lane alternatives, considering the deploying section, the form of bus lane, the configuration of bus stop, the traffic organization of ramp area, and the adjustment of bus lines. Then, we simulate and evaluate the scenarios using the INTEGRATION model. From the analysis results of two indices, i.e. average travel speed and distribution of traffic operational condition, it is found that although the infrastructure and traffic conditions meet the deploying requirements, the traffic indices results of the western 3rd ring-road decreased, and deploying bus lanes cannot improve the traffic efficiency. The key constraining factor is that separating automobiles and buses will complicate lane-changing and entry and exit of traffic near ramps. Therefore, it is suggested that such deployment be coordinated with the ramp control and the optimization of bus lines to improve the effects.

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Monitoring Data Exchange of Highway External Field Equipments Based on Primitives

WU Yun-xiang, CHEN Qi-mei, AN Ming-wei,LU Yi

2011, 11(1): 56-60 .

Abstract ( )

Aiming at various external field equipments and the complex bottom protocol of highway, based on analyzing the intelligent transport communication protocol architecture and existing data exchange mode, the protocol architecture of data exchange based on primitives is proposed. We describe the subject and the package of primitives, and define the identifier of relevant unit of external field equipments. Taking the camera as an illustration, we describe the composing of application service data unit, unite data format and communication statute, and standardize the monitoring date of region networking and the monitoring command of romote conreol external field equipments, then provide the overall framework of system, and set up a complete control platform for external field equipments. The platform completes the data exchange and shields the bottom device interface details, so the monitor application system is transparent.

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Variable-Bandwidth Progression Optimization in Traffic Operation

HU Pei-feng,TIAN Zong-zhong,YUAN Zhen-zhou,JIA Shun-ping

2011, 11(1): 61-72 .

Abstract ( )

Attempts are often made to find an optimal coordinated control plan for a group of traffic signals in urban areas, such that platoons of vehicles can proceed through a continuous series of green lights without stopping, thereby reducing considerable unnecessary delay. One main objective of coordinated control is to provide the maximum bandwidth progression by adjusting the offset and phase sequence pattern for each signalized intersection. Most models and methods currently being used are based on mixed-integer linear programming (MILP), which is a mathematical optimization model originally formulated by Little et al. in 1966. A basic limitation of the MILP is that it adds a large number of complex constraints for traffic control networks. In this paper, a new simple method is introduced for finding the optimization plan of arterial and network control by maximization of variable bandwidth. This method has not any "loop" constraints and a completely new approach compares to the MILP method applied in this field. In addition, the results of two examples this paper provided validity and feasibility of this new approach in real applications of traffic signal coordination control.

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Restriction Analysis of Residual Capacity of Intersection on Land Development Intensity

LIU Zhi-qiang,CHEN Jie, NI Jie,ZHANG Li

2011, 11(1): 73-78 .

Abstract ( )

At present, the common existing problem of Traffic Impact Analysis (TIA) is that there is no control on land development intensity on the stage of approval. This paper evaluates the restriction of residual capacity of intersection on land development intensity. Intersection is frequently a bottleneck of urban road network. With estimation of the proportion of turning flow and consideration of traffic organization, this paper analyzes the production or attraction of the project impact on intersection, and the restricting relations between the residual capacity of intersection and land development intensity in a micro-level. It should form a “Traffic Impact Analysis Opinion” on land development during the process of control regulation adjustment, which can be regarded as a pre-supplementary evaluation for the TIA, to effectively control the “source” of traffic generation. Moreover, an example is used to illustrate the feasibility and operability of the proposed method.

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Traffic Behavior Analysis of Non-motorized Vehicle under Influence of Curb Parking

GUO Hong-wei,GAO Zi-you,ZHAO Xiao-mei,YANG Xiao-bao

2011, 11(1): 79-84 .

Abstract ( )

To analyze the lane-crossing behavior of non-motorized vehicles under the influence of curb parking, the lifetime data analysis method is adopted to examine the observed data for non-motorized vehicles. The concept named valid volume is introduced to describe the relation between the probability of lane-crossing behavior and non-motorized vehicle volume, evaluate the influence of curb parking, then a nonparametric method and a parametric method are used to estimate the model with censored data. The results indicate the curb parking has a significant influence on the traffic behavior of non-motorized vehicles. It can decrease the valid volume and increase the likelihood of lane-crossing behavior. The results are expected to help evaluate the influence of curb parking on non-motorized vehicles and improve the planning and management of curb parking.

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Vehicle Routing Problem with Time Windows Based on Spatiotemporal Distance

QI Ming-yao, DING Guo-xiang,ZHOU You,MIAO Li-xin

2011, 11(1): 85-89 .

Abstract ( )

Vehicle Routing Problem with Time Windows (VRPTW) is a well known NP-hard problem. A typical way to solve this problem is to partition the customers into groups first and then construct optimal routes for each group or groups. Conventionally, customers are partitioned according to the spatial distance only, while ignoring their time window requirements. In this paper, we consider jointly spatial and temporal characteristics of customers and propose a spatiotemporal distance based criteria for customers partitioning. To improve the initial solution, a tabu search algorithm is developed. To improve the convergence efficiency, this algorithm limits the objective value ranges that around the recently visited solutions, Instead of limiting recently visited solutions, the performance of the proposed algorithm is examined with Solomon benchmark problems. The results indicate that spatiotemporal distance is more effective than spatial distance when solving vehicle routing problems with narrow time windows. Some results are even comparable to the best results obtained so far.

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Network Optimization of RPTB Express Based on Ant Colony Algorithm

YANG Zhong-zhen,ZOU Wen-qian

2011, 11(1): 90-95 .

Abstract ( )

As a sub-business of highway passenger transport, road passenger transport based express (RPTB) has obtained good benefits through relying on passenger transport. However, direct delivery restricts the capacity and structure of its transport network. In order to enhance the network capacity, improve network structure and strengthen the advantage of its timeliness, this paper proposes an idea of transfer delivery. Based on the idea, the paper optimizes the network structure of the RPTB express with the aim to minimize the transport time. Since the optimization model is a transport network design problem with a time window, the traditional algorithm cannot be used to solve the model. Thus, a heuristic algorithm-ant colony algorithm is used. Numerical examples indicate that the optimized transport network can save time and enhance the capacity of the RPTB express.

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A Two-Level Optimization Model and Algorithm for Energy-Efficient Urban Train Operation

DING Yong,LIU Hai-dong, BAI Yun,ZHOU Fang-ming

2011, 11(1): 96-101 .

Abstract ( )

Metro takes the most part of energy consumption in urban public service systems, it’s important to make the train movement in an energy-efficient way. Based on the characteristics of train movement and control rules of locomotive, an urban train running on an uneven rail with the specific run-time for minimal energy consumption can be formulated as a two-level hierarchical problem. On the first leve1, an optimization model is designed to decide the appropriate coasting point(s) and number(s) of inter-station run for energy-efficient urban train operation. On the second leve1, an optimization model of arranging the train travel time of inter-station run is presented for minimal energy consumption. Algorithms for solving the two-level optimization model are developed based on Genetic Algorithm. A case study shows that the two-level optimization model and algorithm are effective for energy-efficient urban train operation on a long-distance line with several sections. The result indicates that the two-level method can save energy 19.06% within scheduled run-time and enhance the recovery ability of train movement compared with traditional method.

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Urban Mixed Traffic Flow Considering the Influence by Origin-Destination of Public Transportation

HU Jun-hui,YANG Li,KONG Ling-jiang, YANG Yong-xu

2011, 11(1): 102-107 .

Abstract ( )

With the increasing of cars, the influences of bus stops on urban transportation have become increasingly prominent. The researches about the origin-destination of public transportation will help to optimize layout of bus stops, reduce the influences of origin-destination of public transportation on the traffic, and improve the traffic efficiency of bus station road. In this paper, basing on the nagel-schreckenberg models of traffic flow and using the two-lane aggressive lane-changing rule, the influence of the origin-destination of the public transportation on the urban bidirectional four-lane mixed traffic flow is simulated with the open boundary conditions. Taking the departure time interval, the inject probability and the location of the origin-destination of the public transportation. We get the reasonable value of the bus departure frequency and the location of public transportation, which can offer a practical reference to the improvement for the urban road traffic and the traffic management.

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Ramp Metering Research of Junction Based on Fuzzy Neural Network Model

CHEN Feng,JIA Yuan-hua, NIU Zhong-hai,YI Hui-xin,SONG Hui-juan

2011, 11(1): 108-113 .

Abstract ( )

On relieving the growing serious urban traffic congestions, the problem of designing fuzzy control strategies for periphery networks that include freeway and related urban expressway(abbreviations: junction) is considered starting with the analysis on impact factors about ramp metering control. The presented novel methodology based on the fuzzy control and neural networks modeling paradigm whose input variables are the differentials between mainline real condition and expected condition and the ramp condition and output variables is the ramp control metering law. Based on the strategy, combining with space structure analysis of interchange in real world, the control metering method for single ramp and coordinated double ramps control metering is presented respectively and the corresponding 5 layer fuzzy neural network (FNN) model is also built. A preliminary simulation-based investigation of the ramp metering control problem for periphery networks consists of G2 freeway, the 3th and 4th ring road using the methodology demonstrates the comparative efficiency.

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Research on Identification of Black Spot and Accident Inducing Factor for Freeway

MENG Xiang-hai,LI Mei,MAI Qiang,GUAN Zhi-qiang

2011, 11(1): 114-120 .

Abstract ( )

In order to improve the objectivity, fairness and automated identification level of black spot identification, dynamic clustering algorithm, which is used to divide initial assessment of sites along the road, is proposed firstly. Then, the self-organizing neural network model is established to identify black spot. Thirdly, black spot prominent accidents induced factors’ identification process based on discrete multi-variable algorithm combined with probability distribution is presented. The results show that the initial assessment based on dynamic clustering method can describe the accidents’ concentration and dispersion objectivity, while the neural network model can give an automatic classification to the initial assessment of the security situation and the results are more reasonable. In the master can meet the requirements of statistical analysis of accidents on the basis of the number of sample points, black spot prominent accidents inducing factor identification methods, which can be used to establish a set of evaluation criteria and identify prominent accidents inducing factor.

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Research on Accessibility Improvement of Urban Public Transport Network Based on Metro

YU Wei,MA Jian-xiao,ZHANG Yong-hui

2011, 11(1): 121-125 .

Abstract ( )

With the continuous expansion of urban scale, the appearance of metro alleviates the problems of urban traffic congestion to some extent. Numbers of cities in China have been launched or are planning a number of new subway lines. How to assess the role of accessibility improvement about the subway for urban public transport, so as to provide theoretical support for making decisions in programming sites and distributing lines, is an urgent need for concern. Combining with the method of complex network, looking the bus stations as nodes and the connections between the sites as edges, the topology model of public transport network including metro lines in Nanjing is established. With the minimum number of sites between sites and the minimal transfer times as the measure indicators of transport accessibility, the accessibility effects of metro for urban public transportation network about Space L and Space P model are analyzed. The results show that the opening of the metro improves the overall accessibility of urban public transport network. The accessibility improvement of metro sites to other sites and commercial centers is more obvious.

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Bi-level Programming Model and Algorithm on Location of Logistics Distribution Center

DUAN Gang,CHEN Li,LI Yin-zhen, CHEN Zhi-zhong,HE Rui-chun

2011, 11(1): 126-129 .

Abstract ( )

The decision-maker not only considers the competition with the existing logistics distribution centers but also predicts the future latent competitor when locating a new one, or else he will be inferior. A bi-level programming model on location for the decision-maker is modeled based on the frame of “the existing distribution centers-a new distribution center-a future competitor”. The objective of the upper model is to maximize the new distribution center’s market share in a given horizon, and the lower model is to maximize the future competitor’s. The market share is depicted by multinomial logit model whose observable item is the distance between the distribution center and the demander. A genetic algorithm is designed. At last an example illustrates the effectiveness of the model and the solution.

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Urban Road Traffic Safety Evaluation Method under the Condition of Ice and Snow Pavement

CHENG Guo-zhu,MO Xuan-yan, MAO Cheng-yuan

2011, 11(1): 130-134 .

Abstract ( )

Ice and snow pavement create obvious adverse impacts on motor vehicles’ safety in urban road traffic circumstance. According to analyze driver’s brake reaction time and vehicle’s brake distance on ice and snow pavement, automobile’s parking distances are calculated and given under the condition of different speed and ice and snow pavement types through observed friction coefficient data of snow pavement, rough ice pavement, smooth ice pavement and ice-snow pavement. Driving safety degree of ice and snow pavement is defined based on head-way and paring distance. It can be seen from analysis results that driving safety degree is different significantly when driving on ice and snow pavement if drivers adopt the same speed and head-way. The calculation method of maximal safe speeds under the condition of different speed and ice and snow pavement types are put forward. And suggestion values of car’s maximal safe speed when driving on ice and snow pavement are given.

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Study on Core Competitiveness of Port Group

FENG Xue-jun,JIANG Liu-peng,YAN Yi-xin, LI Cheng-cai

2011, 11(1): 135-141 .

Abstract ( )

This paper aims at the study on core competitiveness of port group, tries to propose a new idea of port group core competitiveness research which based on the reference of traditional methods such as “Diamond model” and “GEM model”. In this new idea, the constituting factors and changing trend of port group core competitiveness are explored from the macroscopic and microscopic perspectives at first, and the DEA model is used to determine the which period of life cycle the port group core competitiveness is in; then, fuzzy synthetic evaluation is used to calculate the intensity of core competitiveness of port group and the “weight-score” matrix is created to identify the core competitiveness of port group and the general competitiveness; at last, the feasibility and correctness of the new idea is verified through the project of port group in Hercynian economic zones.

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Influencing Factors of Energy Consumption for Rail Transport Based on Grey Relational Degree

FENG Jia, XU Qi,FENG Xu-jie,FENG Xue-song, SUN Quan-xin

2011, 11(1): 142-146 .

Abstract ( )

The potential of energy-saving of rail transit is large. Based on the analysis of the industrial statistics data, this paper analyses the energy consumption factor composition and the main influence factors of urban rail transit, passenger-dedicated line and passenger train of the railway line shared by passenger and freight trains using grey relational degree analysis method. Combining industrial statistics data, establish quantify analysis indicators and draw the analysis result. The result shows that, rail transit total energy consumption constitute divided into locomotive running traction energy consumption and the equipment energy consumption in two parts. Locomotive running traction power consumption plays a great role on decision the energy consumption factor of the railway line shared by passenger and freight trains and the passenger-dedicated line. And for energy consumption factor of urban rail transit system, two factors of importance vary slightly. Different affecting factors of rail transit plays a different role on the importance degree of energy consumption factor.

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Research on Severity of Traffic Flow Conflict Based on Physics Collision Theory

YUAN Li,ZHANG Qing

2011, 11(1): 147-151 .

Abstract ( )

To study the roadway intersection, traffic conflict technology is introduced to quantitative analysis of traffic safety, it is proposed that different severities of traffic conflict cause different traffic safety results. The paper analyzes the characteristics of traffic flow at intersection and the severity of different types of traffic conflicts, and researches the angle, deceleration and kinetic energy loss of turning vehicle based on physics collision theory. The relations and models of crossing traffic conflict, diverge conflict and merge conflict after collision are developed. Traffic conflict unit index is developed according to the probability of three traffic conflict types and the level of serious when collision occurs. Finally, the research combine all results for establishing useful indexes of intersection safety, and it is very important to focus such issues by traffic engineers.

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Study on Conflict Probability Model between Motor Vehicles and Pedestrians at Intersections

SHEN Jia-jun,WANG Wei

2011, 11(1): 152-156 .

Abstract ( )

In order to quantify the traffic conflict between motor vehicles and pedestrians at urban intersections, conditions under which traffic conflict may occur are presented at first, then three critical parameters which influenced traffic conflict probability are selected including distribution law of motor traffic headways, critical gap of pedestrians crossing motor vehicles and occupying duration of pedestrians, afterwards the function relation between amount and occupying duration of pedestrians is constructed with photogrammetry and the critical gap with occupying duration of a certain amount of pedestrians is compared, finally the condition that several rows of pedestrians occupied conflict zone is analyzed and the conflict probability model between difference configurations of pedestrians and motor vehicles is developed. The values of conflict probability is calculated through an actual example. The results indicate that the conflict probability increases with the volume of pedestrians growing, which accords with traffic actual working condition.

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Short-Term Highway Traffic Flow Prediction Based on Mixed AGO-SVM

ZHANG Tong,ZHANG Jun, YANG Xiao

2011, 11(1): 157-162 .

Abstract ( )

Our goal is to present a mixed AGO-SVM highway traffic flow prediction method. Pretreatment traffic flow data following some rule is generated by accumulated generating operation and is modeled and predicted by support vector machine algorithm. Traffic flow data of the next moment in the highway is retrieved by inverse accumulated generating operation. Predicted data is kept updating, the sample sequence is maintained and the highway traffic flow is predicted through recursive prediction. The effectiveness of the algorithm is verified by Xi-Bao highway traffic flow data. The results show that the proposed method is more effective than gray model algorithm and support vector machine algorithm in prediction accuracy.

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Spectator Arrival and Departure Traffic Mode and Influence Factors in Beijing Olympic Games Opening and Closing Ceremony

LIU Xin-hua,SUN Zhuang-zhi, YAO Guang-zheng

2011, 11(1): 163-167 .

Abstract ( )

In the Olympic Games opening and closing ceremonies, participants’ arrival and departure transportation demand in small area and short period of time with high volume is a great challenge for transportation services. Analyzing the arrival and departure traffic mode is the basis of traffic organiziation. With the survey data collected from the opening and closing ceremonies, this study explores the traffic mode structure of spectators’ arrival and departure. This study compares the different mode structures of opening and closing ceremonies, reveals several factors and analyzes their impacts on arrival and departure traffic mode choice, namely, management policy, traffic mode timeliness, transportation supply, media propagandize, and the origin of spectators. The study provides suggestions for proper traffic control, management policy isssue, and traffic organization of the Olympic Games and other big events.

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Calculation and Analysis of Traffic Congestion Cost in Beijing

WU Qi-bing,CHEN Feng,HUANG Yao,HU Ying-yue

2011, 11(1): 168-172 .

Abstract ( )

In order to quantify the cost arising from traffic congestion of Beijing economically, and provide the basis for the decision-making departments to formulat correlated policy, the paper study on the traffic congestion cost in Beijing. After detailedly described the traffic congestion cost at home and abroad, this paper proposes the critical velocity, analyzes the sub-costs of traffic congestion, and establishes the calculation model of the three sub-items cost which are time, energy consumption and gas costs. This paper not only calculate the traffic congestion cost in Beijing in 2008 and compare it with overseas research, but also predicte the traffic congestion cost in Beijing in 2009 and do sensitivity analysis on it. The economization of the cost contribute to analyze the relationship between the traffic congestion cost and the socio-economic more intuitively, which can also provide reference for the decision-making of alleviate traffic congestion and the Realization of a low-carbon trip.

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Research on Influential Extent of Weaving Area on Urban Expressway Cloverleaf Interchanges

ZANG Xiao-dong

2011, 11(1): 173-178 .

Abstract ( )

The influential extent of weaving area is an important factor in the research of the cloverleaf interchanges capacity. This paper has analyzed the limitation of using the dividing principle in the diverging area, the merging area and the weaving area from HCM2000 on cloverleaf interchanges. Based on the data surveyed on the cloverleaf interchanges in Guangzhou, according to the theoretic analysis and the statistic theory, researching the time headway distribution characteristics in the upstream and the downstream of A type weaving area(Weaving vehicles in both directions must make one lane change to successfully complete a weaving maneuver.) and C type weaving area (Weaving vehicles in one direction may complete a weaving maneuver without making a lane change, whereas other vehicles in the weaving segment must make two or more lane changes to successfully complete a weaving maneuver), the researching results have verified that the weaving area influences the traffic flow characteristics of its upstream and its downstream, and the time headway distribution in upstream and downstream of A type weaving area and C type weaving area of cloverleaf interchanges accords with the three parameters Weibull distribution, then according to the variational rule of shape parameter in Weibull model with the distance, the paper confirms the influential extent of A type weaving area and C type weaving area to its upstream and its downstream.

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Research on Traffic Information Cloud Computing and Its Application

SHI Jian-jun,LI Xiao-li

2011, 11(1): 179-184 .

Abstract ( )

Cloud computing can provide traffic information almost unlimited and scalable computing ability with high-speed network to link up all kinds of computing power. Traffic information cloud computing is considered as a new concept for efficient information acquisition and service based on the analysis of the advantages, features, methods and deployment of traffic information cloud computing and it is essential for traffic behavior control. Taking the acquisition, transmission, calculation and application of vehicle GPS information, the existing floating car information processing method is compared with that of cloud computing. A method for cybernetic route guidance is proposed by cloud computing providing drivers high utility and closed-loop verifiable personalized route guidance information.

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