城市信号控制路网中的路段行程时间估计方法

为了精确检测城市信号控制路网中的路段动态行程时间,分析了路段流量受交通信号控制策略影响的波动规律,提出了基于交通量图偏移的路段行程时间计算方法。研究了不同断面交通量图的相似性,根据最大相似度时交通量图的偏移,计算了断面间路段动态行程时间,并与调查结果进行了比较。比较结果表明:在城市路网封闭路段,平峰、高峰的不同时间长度内(5、10、20 min),平均行程时间最大平均相对误差为7.1%,因此,计算方法可行。

Travel time estimation method in urban road network with signal control

In order to precisely monitor the dynamic travel time in urban road network with signal control,the fluctuation rule of traffic volume affected by signal control strategy was analyzed,and a travel time estimation method based on traffic volume diagram offset was proposed.The similarity of traffic volume diagrams under different cross sections was analyzed,the dynamic travel time between cross sections was computed according to the offset of traffic volume diagram when the maximum similarity was reached,and it was compared with the field survey data.Comparison result indicates that the maximum mean relative error of mean travel time is 7.1% for different time lengths(5,10,20 min) during peak and non-peak periods at the closed road segments of urban road network,so the method is feasible.