Multiband Model Improvement Method And Application Research

Constrained by space,road infrastructure cannot be expanded indefinitely,and increasing traffic demands overload the road network.This has been accompanied by increased traffic congestion,frequent traffic accidents and increased atmospheric pollution.The arterial traffic signal coordination model optimizes the traffic signal timing parameters of the road network so that the vehicle can pass through the intersection as much as possible to reduce the number of vehicle parking and waiting time.This is of great significance to alleviating urban traffic problems and improving road network traffic efficiency.The classic model of arterial traffic signal coordination model — MULTIBAND model,due to strict centerline constraints of bandwidth,the bandwidth in the MULTIBAND model is unstable.The existing improved method has less research on the position of the initial queuing and emptying time.In the calculation,there is mostly an artificial queuing clearing time,and no accurate calculation formula is given.On the other hand,most of the existing researches are aimed at intersections,and there is less research on the coordination of left-turn traffic at T-shaped intersection.Due to the difference in the phase mode between the T-shaped intersection and the intersection,the general formula for the midpoint interval between the outbound and inbound red lights established for the intersection does not apply to the T-shaped intersection..Therefore,the research work done in the paper on the problems in the MULTIBAND model research is as follows:According to the correlation theory of traffic waves,the calculation model of the initial queue emptying time is deduced.On the other hand,taking into account the position of the initial queuing clearing time,the green band center line in MULTIBAND model—is removed,and the positional relationship constraint between the position of the initial queuing clearing and the bandwidth edge is increased.Under the conditions,an modified MULTIBAND model for intersections was established.Finally,using the different coordination speeds to compare modified MULTIBAND model with the classic MULTIBAND model.The results show that the improved bandwidth can be achieved in the modified model,and the green wave bandwidth is stable.(2)Based on the improved multi-bandwidth green wave coordination control model for intersections,a modified MULTIBAND model foor the T-junction is proposed.Aiming at the actual phase release mode of the T-shaped intersection,the general formula of the variable corresponding to the time difference between the outbound and inbound red light at the T-shaped intersection was deduced,the bandwidth constraint was increased,and the example verification and simulation were performed.The results show that the model can achieve better coordination effect and effectively reduce delays and stoppages.(3)Based on the modified MULTIBAND model for intersections and T-shaped intersections,an intelligent traffic management and coordinated control system was designed and developed.The bandwidth coordination control module is divided into two types: facing the intersection and facing the T-shaped intersection.In this paper,the logical function structure design and overall system framework design of the system are completed,and the overall function of the system is realized.