关键词: Webster 法；遗传算法；信号配时；交叉口仿真优化

Abstract: With the accelerating pace of urbanisation, traffic congestion, environmental pollution and safety concerns have become increasingly prominent. As key nodes within the road network, the traffic organisation and signal control at intersections play a crucial role in enhancing traffic flow efficiency and alleviating congestion. Dynamic signal timing optimisation for traffic-controlled intersections is achieved by solving for initial values based on the Webster method, combined with a genetic algorithm (GA). Taking the intersection of Changcheng Road and Xingyang Road in Qingdao as the research object, the data collection is carried out by the method of on-site terrain survey combined with video recording observation. The PTV-VISSIM (2025) software is used to establish the models of the intersection before and after optimization and the relevant service evaluation. The research results show that after the timing optimization, the overall delay of the intersection is reduced by 24.03%, and the service level is improved from D to C, significantly improving the operation efficiency of the intersection, thereby verifying the feasibility of the optimization scheme.

Key words: Webster method; genetic algorithm; signal timing; intersection simulation optimization