公交优先的信号交叉口配时优化方法

Optimal signal-planning method of intersections based on bus priority

传统的交叉口信号配时方法将所有车辆同等对待,对于公交车辆比例较大的相位是不公平的。提出了以人总延误最小为信号周期时长的优化目标,以相位乘客流量比和相位饱和度确定绿信比的方法。应用分析表明,按照这一方法进行配时,虽然车均延误比用传统方法进行配时略大,但公交车辆和人均延误却降低了约30%,在保障交叉口交通顺畅的前提下体现了公交优先,减少了公交车辆在信号交叉口的延误。

By the traditional signal-planning method, cycle is determined according to minimum average vehicle delay, green time is determined according to the vehicle flow ratio of phases. The traditional signal-planning method is unfair to these phases with a big proportion of bus, because a bus can load more passengers than a non-bus does. This paper set up a signal-planning method, in which the average people delay is regarded as an optimal aim of cycle, and green time is determined according to passenger quantity and the saturation of phases. When according to this method to plan signal time, though average vehicle delay is bigger than that of traditional method, but average bus delay and people delay are reduced near 30%. Applied results show that this signal-planning method provides priority for bus, and reduces bus delay on the premise of ensuring smooth traffic.