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分布式交通信号控制系统拓扑结构的分布式特性使得网络的控制问题被划分成不同层次，路口的控制器优化单个交叉口，系统的协调要求每个路口的控制器同时还要考虑相邻路口控制器的配时方案、相邻上游交叉口车辆的离去特性、相邻下游交叉口车辆的到达特性。本文在综合考虑上下游交叉口信号配时、车辆排队和公交运行情况的基础上，提出了实时交通信号控制系统中实施公交优先的模型系统的框架，然后给出信号优化过程和计算最佳绿灯请求时间和信号协调方法。

Research on the Signal Coordination Methodology in a Traffic Signal Control System with Transit Priority

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 has presented the system architecture for distributed real-time network signal control system with transit priority and signal optimization process and described the methodology for determining the most appropriate time for implementing signal switching decisions that explicitly consider upstream and downstream coordination impacts,vehicle queuing and transit activities.