Optimization Model of Regional Green Wave Coordination Control for the Coordinated Path Set

An optimization model of regional green wave coordination control for the coordinated path set is proposed based on the network’s directional and asymmetric actual coordination control demands. The model in this paper selects the coordinated path set as the optimization object and takes the best regional coordination control effect as the optimization objective. By selecting signal timing parameters, such as stage time, stage center point, offset, and cycle length, as optimization variables, the relationship between signal timing parameters and the effect of green wave coordination was established. The stage time of the coordinated stage at the upstream and downstream intersections is used to calculate the evaluation index of the coordination control benefit of the whole road network. The case study demonstrates that this model can optimize coordinated path chains with left-turn traffic flows under green wave coordination management. In terms of network performance, compared with Transyt and Synchro, the signal control scheme obtained by the proposed model can reduce the average delay by about 30% and the average number of stops by about 40%. To meet the requirements of regional green wave coordination control, the proposed model can optimize different signal timing parameters to obtain a wide range of applications of green wave coordinated control in road networks.

I. Introduction

Green wave coordination control can assure coordinated traffic flow with high speed, a low number of stops, and high quality of service in unsaturated traffic situations, improving traffic flow’s smoothness and speed consistency and reducing traffic accidents. Urban traffic signal management, particularly coordination control, is thus a practical approach for boosting traffic efficiency, lowering accident rates, and improving the traffic environment [1].