考虑公交优先的城市交叉口遗传算法信号配时研究

Research on Signal Timing for Urban Intersections with Genetic Algorithms Optimizing with the Idea of Bus Priority

对设置公交专用进口道的城市交叉口信号配时作了研究.考虑公交优先,并从我国城市交叉口的交通特征出发,构造了多目标规划函数:一是使公交总延误最小,二是使一般小汽车交通各相饱和度之间的均方差最小.对于多目标规划,采用功效系数法建立目标评价函数.并利用遗传算法对函数进行优化求解得到信号配时方案.通过仿真实例说明了函数构造及求解的过程.

This paper focuses on the research of signal timing for urban intersections with bus approaches. With the idea of bus priority and from the analysis of traffic＇ s characteristic of China＇ s urban intersections, a multi-objective programming function is constructed to minimize not only the total delay of bus operating but also the mean square value of saturations of car flows of all phases. The efficacy coefficient method is used to formulate an evaluation function that covers all objective functions of the original problem. The evaluation function is optimized by genetic algorithm for obtaining the satisfying signal timing scheme. The study is validated by a simulation test.