Integrating Bus Priority Traffic Signals Research On Coordinated Control Method

Green wave coordination and bus priority are both common methods in the field of road traffic control.However,due to the different optimization subjects of the two methods,each method often sacrifices the operation efficiency of another subject when optimizing.This paper analyzes the causes of the conflict between green wave coordination and bus priority,and combines the advantages of the two coordination optimization methods to realize the traffic signal control coordination method of green wave coordination and bus priority for urban arterial traffic.In this study,we first propose a method to increase the green wave bandwidth by adjusting the phase sequence.By analyzing the non-conflict characteristics between the phases of the intersections,we design the phase sequence of the intersections,and multiple intersections adopt an unconnected phase sequence combination,which can obtain a larger bandwidth than the traditional green wave optimization,and the method is more flexible.This method converts the green wave optimization problem into a path search problem,and can obtain the optimal phase sequence and phase difference of each intersection in the trunk line system,so that the bandwidth of the trunk line system can be maximized.The traditional bus priority methods include green advance,red delay,insertion phase,bus lane(or tidal bus lane)and other methods,but they can not avoid the impact on the efficiency of social vehicles.This paper proposes a green wave signal optimization method considering bus and a dynamic signal control method on the way of bus.According to the bus stop time in each bus station and the position of the bus station in the road section,the bus running time distance is calculated.With the adjustment of phase sequence and phase difference,the green wave control signal is optimized,and the delay of bus operation is minimized without affecting the effect of green wave.In the process of bus operation,the time to reach the intersection is estimated according to the position of the bus in the road section.When the bus cannot pass the intersection smoothly,the phase sequence and non-bus phase duration at the next intersection are adjusted without affecting the green wave effect,so that the bus can pass the intersection smoothly at the bus phase.Finally,according to the travel demand of residents,the maximum departure interval of bus is obtained,and the optimal departure interval of bus is calculated according to the public cycle of green wave coordination.The above method not only ensures the green wave coordination effect,but also minimizes the public.Finally,taking the intersection of Wanquanhe Road and Haidian South Road in Haidian District of Beijing,the intersection of Haidian South Road and Zhongguancun Avenue to the North East Gate as the coordination object of green wave,and the bus of307 from Bagou Village Station to Zhongguanyuan Station as the bus priority optimization object,the simulation is built on the vissim platform.After optimization,the effect of green wave has been greatly improved,and the new bus optimization method has greatly reduced the delay between bus stations.