Research On Synchronized And Coordinated Control For Multipath Traffic

At present,urban road construction has reached the "bottleneck" stage,which is difficult to increase on a large scale.The asymmetry of residents' traffic demand is becoming more and more obvious and the trajectory of vehicle flow has diversified characteristics.The single-path green wave coordinated method can no longer satisfy the current traffic demand of complex paths,so a new multi-path traffic synchronizated and coordinated control method is needed to improve the operating efficiency of intersections.This paper studies the synchronization and coordination of multi-path traffic flow targeting maximizing the benefit of coordinated path traffic,and proposes algebraic method of bidirectional green wave coordinated control,basing the different situations.The main research contents include the following aspects:(1)According to different green wave design requirements and based on the bidirectional middle green wave coordinated control algorithm,it has analysed a bidirectional head and tail green wave coordinated control model.According to different scenarios and the application scope of various algorithms,this paper analyses the current traffic flow situation,determines the design method needed;it calculates the ideal spacing of intersections,and aims at minimizing the sum of the offset splits at the intersections of trunk roads.The optimal signal scheme of urban trunk intersections is solved by programming.The signal timing of urban trunk intersections are coordinated and optimized.The scheme was evaluated with time-distance map and VISSIM simulation platform.(2)This paper establishes the method of selecting coordinated path of social traffic flow,identifies license plate number of social vehicles,analyses the running track of traffic flow,and obtains coordinated path set.Aiming at the problem that the bus flow formation is difficult to maintain consistency,this paper puts forward the control method of bus flow formation maintenance.This paper puts forward the method of bus flow path selection to control the travel station on time,so as to ensure the consistency of bus flow.Bus flow has a certain amount of traffic flow,choosing bus coordination path enriches the content of bus coordination;aiming at maximizing the benefits of coordinated path traffic,this paper puts forward the method of choosing the coordinated path with the largest green wave bandwidth;and lays a good foundation for improving the coordination of multi-path traffic flow.(3)Based on the analysis of the driving characteristics of single-lane cars and the design of timing parameters,a single-lane traffic flow synchronization model is constructed.With the help of optimization design of signal timing parameters,the multi traffic flows are synchronized near the downstream intersection parking line.The combination of multi-lane traffic flows synchronizated coefficient models is analyzed.Taking a single intersection as a node and multiple intersections as a path,the multi-lane traffic flow synchronization coefficient model is constructed by combining and choosing the multi-lane traffic flow supposed to be synchronizated.(4)Taking Tianhe Road in Guangzhou as an example,bidirectional middle coordinated control numerical solution algorithm and multi-path traffic flow synchronization and coordinated control method are used to solve the signal timing scheme.Bidirectional coordinated control method is used to coordinate the green wave design of trunk road for car flow and bus flow,and multi-path traffic flow synchronization and coordinated control method is used to synthetically analyze social traffic flow and bus flow,and the optimal scheme is obtained.The effect of the two algorithms is compared by time-distance diagram and simulation.