Study on Dynamic Optimization and Control Algorithm of Overlapping Phase of the Traffic Flow

In order to further improve the control efficiency of urban intersections, this paper took overlapping phase of the traffic flow as the optimization object, and put forward the dynamic optimization and control algorithm of overlapping phase of the traffic flow at intersection. This algorithm based on the compatibility relation of traffic flow, built the overlapping phase set of traffic flow, according to the switching structure of overlapping phase of the traffic flow, established the intersection benefit function, the traffic flow was dynamically selected to form the overlapping phase according to the minimum queue delay, the timing of the overlapping phase was further optimized with the minimum queue delay as the optimization objective, so as to realize the dynamic optimization and control of the overlapping phase of traffic flow. Finally, the intersection of Huang Shan road and Tian Zhi road in Hefei was tested. The experimental result showed that, after using the algorithm of this paper, the average delay and stop were greatly reduced compared with the method of the fixed-time control and the actuated control when the traffic flow was unevenly distributed and fluctuated at intersection.