关键词: 智能交通, 信号控制机理；实施框架；交通仿真；交叉口群；过饱和状态

Abstract: For the purpose of improving traffic signal control at over-saturated intersection group, the traffic control targets and structure were optimized, and an implementation framework was proposed. After analyzing the congestion inducements, the maximum throughput and minimum average queue of critical route were selected as the optimization objectives.The critical route layer was added to optimize control structure. The implementation framework for signal timing plan optimization was also put forward considering the over-saturated traffic control characters. Detailed optimization measures for each layer were discussed. Simulations with the traffic data of an intersection group at Guangzhou Road in Nanjing were selected to compare the performance of dynamic timing plan using proposed strategyand static timing plan. The results indicated the proposed method can be used to optimize traffic signal control of over-saturated intersections group with satisfying robustness and reliability.

Key words: intelligent transportation, mechanism analysis for traffic signal control, implementation framework, traffic simulation, intersection group, over-saturated status