Research On Optimization Control Strategy Of Human-vehicle Signal Coordination At Parallel Flow Intersection

With the continuous growth of vehicle ownership,urban traffic congestion is becoming more and more serious,and the phenomenon of over saturation is frequent at intersections.The capacity advantage of unconventional arterial intersections designs makes its theoretical research more and more important.As a kind of unconventional arterial intersection designs,parallel flow intersection can increase the capacity by about one time in theory.However,due to the multiple parking problems of vehicles,the loss of traffic rights and interests is serious.This paper focuses on solving the safety problems of multiple parking and pedestrian crossing at parallel flow intersections,and provides theoretical basis and basic support for promoting the engineering application of parallel flow intersections in China.This paper analyzes the shortcomings of the existing left turn left parallel flow intersection design,redesigns the left turn center and left turn right parallel flow intersection,selects the left turn right parallel flow intersection as the research object through the scheme comparison,and provides the basis for setting the marking line.According to the special geometric design of parallel flow intersection,the traffic flow organization scheme of no secondary parking is given.Combined with the derivation process of constraint conditions,the scheme of motor vehicle signal control phase is designed considering the late start and early close of phase,and the optimal control model of motor vehicle is established,so that the vehicles in all directions can stop once at most.It is found that there is an incomplete positive correlation between the capacity of parallel flow intersection and the cycle time,and there is a maximum capacity.Then,the basis for setting the displaced left turn lane is given.In this paper,the number of left turn stops at parallel flow intersections is reduced from three to one,and the number of straight stop stops is reduced from two to one.This paper discusses the problems existing in the application of the classic crossing mode of sharing phase between people and vehicles under the two-phase signal control scheme,analyzes the types of pedestrian and motor vehicle conflict,and focuses on the pedestrian and left turn vehicle flow conflict released in the same phase,discusses the operation law of pedestrian and motor vehicle at the conflict point,so as to design a pedestrian crossing mode with pedestrian vehicle overlapping phase.Considering the pedestrian specific phase crossing mode,the paper gives the organization scheme of pedestrian flow traffic,solves the problem of pedestrian and vehicle conflict,and ensures the pedestrian crossing safety.The optimal control model of pedestrian and vehicle signal coordination in parallel flow intersection under pedestrian lap phase crossing mode and pedestrian specific phase crossing mode is constructed respectively.The case study shows that there is no overlap between the conflict phases of people and vehicles,which verifies the feasibility of the traffic organization scheme in this paper.Through the parameter sensitivity analysis,the paper further discusses the influence of pedestrian crossing on vehicle capacity and vehicle delay at intersections,and analyzes the traffic scenarios applicable to the two crossing modes.he results show that,compared with the traditional intersection design,the capacity of the parallel flow intersection under the mode of pedestrian vehicle overlapping phase crossing increases by 50% ～ 91.22%,and the delay of vehicles reduces by more than 50%,which effectively improves the operation efficiency of the intersection.The research results provide a new perspective for parallel flow intersection control,and can also be cited in continuous flow intersection control.