Research On Signal Coordinated Control Of Urban Road Trunk Line

With the rapid development of social economy,the increasing of private car ownership rate,the serious road congestion,the increase of vehicle parking delay,which seriously affect the road capacity,how to solve these problems will be the focus of this paper,that is,how to combine the intersection to improve the capacity.Firstly,this paper introduces the research status of urban traffic trunk line coordination control in detail,analyzes the advantages and application conditions of NEMA double ring phase structure.At the same time,the relevant control methods of urban traffic signal control,the basic parameters involved in the control and system evaluation indicators are introduced.Secondly,it introduces the important parameters involved in the coordinated design of the trunk line,such as the common period and the green signal ratio.At the same time,it focuses on several methods of phase difference optimization,the detailed steps of point control timing and how to optimize the principle and method of phase sequence.Then,on the basis of NEMA double ring phase structure,this paper puts forward the maximum green wave bandwidth model and numerical solution optimization model,taking 20 intersections along the Yellow River Road in Dalian City,Liaoning Province as an example.Finally,VISSIM simulation software is used to compare and analyze the maximum green wave bandwidth model with the current situation and numerical solution,and verify the research results of this paper.The simulation results show that: compared with the current situation,the maximum green wave bandwidth method is more optimized,which shows that the vehicle delay is reduced by 29.6%,the queue length is reduced by 27.4%,and the travel time is reduced by 20.4%;similarly,the maximum green wave bandwidth method is more optimized than the numerical method,which has obvious optimization in delay,queue length and travel time,which are reduced by 18%,11% and 19%,respectively.;in the case of two periods,the maximum green band method is also optimized compared with the numerical method,which reduces the delay,queue length and travel time by 53.1%,52.3% and 28.5% respectively;Compared with the traditional two period coordinated control,the improved two period coordinated control reduces the average delay by 24.1%,the average travel time by 8.1%,and the average queue length by 11.5%.At the same time,the service level has also been significantly improved.So in general,the maximum green wave bandwidth method can greatly optimize the phase difference and improve the road capacity.