Study On Traffic Emergence Manegement System And Some Related Theoretics Questions

Traffic incidents always result in every kinds of congestion, reducing the serviceefficiency of traffic facilities and damaging the interests of road-users. Therefore, it isnecessary to detect and manage traffic incidents happened in urban traffic network. Atthe same time, emergence management of traffic incidents will be an effective meansto reduce the possibility of second-incidents. From the point of view of incidentmanagement, this thesis focuses on three sections as follows.The first section (the 1st chapter and the 2nd chapter): Design of the TrafficEmergence Management System. On the basis of analyzing traffic incidents'characteristics and researching traffic incidents' impacts on traffic flows, the paperproposes an Urban Traffic Emergence Management System (UTEMS) which adaptsto the urban traffic conditions in China, in the light of the definition of emergencemanagement in the Intelligent Transport System (ITS) Architecture and some existingresearch results of developed countries. Every sub-system's function is well explainedand the information flow for the system running is showed in a flow chart.The second section (the 3rd chapter): Study on the vehicle delay caused bytraffic incidents. Traffic incident cuts off the traffic flow into discontinuous flow,giving rise to congestion and vehicle delay. This chapter analyses the vehicle delayqualitatively and quantitatively. Applying the traffic flow wave theory into vehicledelay studying, this paper calculates the speed of the concentrate wave and thevolatilization wave. A simulation experiment proved the research result.The third section (the 4th chapter): Study on the emergence dispatch problem. Itis essential to respond to traffic incident in time because the jam will be diffused onexponent as time goes on. Based on the vehicle delay estimate refer to the 3rd chapter,this chapter analyzes the tralel time on the road where incident happened, clarifyingthe distributing state of travel time according to the various state of incident. Furthermore, the shortest path from retrieval depots to incident spot is researched. At last,this paper mainly discusses the emergence dispatch problem using a practical multipleobjectives decision-making method, on the ground of shortest path caculating.The 5th chapter reviews the whole thesis and sums up some research fruits,putting forward the directions of further study.