城市交通信号灯的配时优化

Timing Optimization of Urban Traffic Signal

研究了城市相邻两交叉口信号配时问题.先以单交叉口为研究对象,选择道路通行能力和平均延误时间作为评价指标,构造多目标联合优化函数对平均延误时间进行修正,建立最优信号配时模型.再确定A,B交叉口的相对位置,引入平均延误时间,结合两交叉口各现行参数,得出左转、直右转车道的实际饱和流率.运用遗传算法进行优化,得出最优配时方案.仿真模型检验结果表明,该方案对缓解交通压力的效果显著.

The signal timing problem of two adjacent intersections is studied. First,a single intersection is taken as the object of study. The capacity and the average delay time are selected as the evaluation indexes. The multi--objective joint optimization function is constructed. The average delay time is modified to establish the optimal signal timing model. Through determination of the relative position of A and B intersections and introduction of the average delay time, and according to the current parameters of the intersections, the actual saturation flow rates of the left-turn and right--turn lane are calculated. The genetic algorithm is used to calculate the optimal timing scheme and the simulation model is tested. The results show that the scheme has a significant effect on relieving the traffic pressure.