基于延误分析的交叉口信号配时优化研究

为了有效减少在饱和度很大甚至超饱和状态下的信号交叉口延误计算误差,更好地优化周期长度和有效绿灯时间,以总延误为目标函数,从饱和度出发,根据饱和度的计算结果,选取不同的延误计算模型。在饱和度较小时,采用Webster稳态模型;当饱和度增大到0.9以后,采用Akcelik瞬态延误模型。并通过实例计算,把优化结果和原有结果进行比较,说明根据饱和度来选取延误的计算模型能有效减少延误,提高交叉口通行能力。同时对信号周期和有效绿灯时间进行优化,避免了单项优化的弊端。

Study on intersection signal timing and optimization based on delays

In order to minimize total delay and optimize signal cycle time and effective green time when saturation is quite high especially supersaturated,optimizing function is made in this paper.Starting from saturation,dif- ferent models are chosen according to the result of saturation.While the saturation is low,Webster steady model is used.Akcelik instantaneous modal is chosen if saturation reaches 0.9.Though the exemplification of the model and the comparison between optimization results and original results,it can decrease errors and improve intersection capacity according saturation.In order to avoid the abuse that caused by optimizing unitarily,Mode- ls should be constructed to optimize signal cycle time and effective green time at the same time.