Signal timing Coordination optimization for intersections adjacent to roundabout

Abstract Aiming at the problem of traffic congestion or even locking in the roundabout, this paper takes the traffic flow of the roundabout as the research object, and researches the coordinated control method of the intersection near the roundabout. Firstly, the traffic flow theory is applied to the roundabout and its upstream intersection, and the correlation on the regional relationship and geometric condition between the inlet area and the weaving area of the roundabout and the upstream intersection is analyzed. The traffic state change between the regions is used to represent the traffic flow operation. and the upstream entrance of the intersection is used as the control source to apply the theory of coordinated control of signals at arterial intersections, combining regional relationship and geometric condition.The roundabout of Huanan Square in Dalian is used as a case study to solve the problem of internal locking of the roundabout.The results show that this method can play a good role in solving the serious congestion of the roundabout.