关键词: 交通信号控制系统, 信号配时优化, 信号协调方法, 绿灯请求时间

Abstract: Network real-time traffic signal control problems can be decomposed into a series of sub-problems of manageable complexity and size using either hierarchical or fully distributed approaches. In the hierarchical approach, the network optimization problem is transformed into a multi-level control problem with distinct optimization objectives at each level. In the distributed approach, the network control problem is broken into a series of smaller problems that can be solved in parallel by independent processors. This paper presents system architecture for distributed real-time network signal control system with transit priority and signal optimization process, and describes the methodology for determining the most appropriate time for implementing signal switching decisions that explicitly considers upstream and downstream coordination impacts，vehicle queuing, transit activities.

Key words: Traffic Signal Control System, Optimization of Signal Timing, Signal Coordination Methodology, Green Signal Request Time