饱和交通状态下的绿信比优化及其应用研究

在饱和交通状态下，Webster绿信比优化模型要同时消散各个方向上的拥挤车流，忽略饱和与非饱和交通状态下的车流特征差异，导致信号交叉口各个方向上的排队车辆越来越长，为此，提出采用通行优先权的方式，对交通需求大的方向给予更多的绿灯时间，以期实现尽快消散该方向上的拥挤车流．各个方向（相位）通过轮流获得相位通行优先权进而逐步消散各自方向上的拥挤车流，最终达到预防交通拥挤和快速消散交通拥挤的优化目标．仿真实验证实，本优化方法在处理饱和交通流上较Webster绿信比优化模型更有效．

Green ratio optimizing and application in saturated traffic flow

The Webster's model of green ratio clears the crowded vehicle flow for each approach at the same time in the saturated traffic flow,but ignores the difference of vehicle flow in the different traffic states,and leads the queue of automobiles more and more at a saturated intersection.It introduces a method of passing priority.It deals more green time for high demanding traffic flow,and hopes to clear the crowded vehicle flow.Each phase gets priority in turn so,in the end,it can realize the goal of preventing traffic congestion and clearing traffic flow quickly.The method has more effectiveness than the Webster's method in dealing with saturated traffic flow through experimental simulation.