Modes And Measurement Of Vehicle Queuing On The Links Between Adjacent Signalized Intersections With Different Cycles

With the rapid development of economy, people’s purchasing power has been greatly improved, which makes travel demands raise rapidly and the ownership of motor vehicles continues growing rapidly. However, due to the limited urban land, the uncertainty of traffic planning and management, the delay of responding to emergencies and many other problems of urban transportation, which makes traffic demand which is much greater than traffic supply, and urban traffic congestion occurs frequently. Therefore, how to relieve traffic congestion in urban traffic network has become an important problem in the research field of transportation planning.In order to relieve traffic congestion, first it is necessary to research on the formation and dissipation process of vehicle queuing. In this paper, the queuing process on the links between adjacent signalized intersections with different cycles was mainly discussed, and then the dissipation queue lengths were calculated by combing the signal red offset and traffic flow rate under different conditions.By consulting the literatures in the recent years, the advantages and disadvantages of the current vehicle queuing models were summarized, so were their characteristics. Based on the shock wave theory, the queuing dissipation processes for the upstream and downstream traffic flows on the links between adjacent signalized intersections with different cycles were analyzed, respectively. Finally, the vehicle queue length models were developed and a simulation scheme was designed by using the traffic simulation software VISSIM. By combing the signal red offset and traffic flow rate under different conditions, the queue dissipation lengths were calculated. The results show that the built model is reliable and the longer the cycle length is at signalized intersections, the longer the average and maximum queue dissipation lengths are accordingly.The main work of this paper is that the vehicle queue length models for the upstream and downstream traffic flows were developed on the links between adjacent signalized intersections with different cycles on the basis of the shock wave theory. This paper introduces the shock wave theory to urban transportation system, and provides a reliable method for studying the queuing process for the upstream and downstream traffic flows on the links between adjacent signalized intersections with different cycles. The research achievements can improve the applications of the shock wave theory in urban traffic network.