信号控制交叉口车均延误模型适用性分析

Applicability analysis of vehicle delay models for isolated signalized intersection

构建一种基于一定交通需求和信号控制的实验环境,对比分析了4种经典的信号控制交叉口车均延误模型的适用性。首先,从模型结构和变量个数两个角度比较了4种车均延误模型在使用过程中的难易程度。然后,针对微观交通仿真软件VISSIM,研究了检测区段和分析期对延误测算值的影响。最后,通过对交叉口饱和度与周期时长进行交叉分类设计了多种实验方案,进而对比分析了4种车均延误模型与仿真模型的吻合程度。结果显示,Webster模型简单易用,倾向于低估延误,其适用性最差;ARRB模型较为复杂,其适用性最好;HCM1985模型同样简单易用,其适用性一般;HCM2000模型适用范围广但过于复杂,其适用性一般。总体来讲,对于单点信号控制交叉口,ARRB车均延误模型在估计车辆延误方面有最好的性能表现。本文研究成果能为选用车均延误模型提供理论依据与参考。

To analyze the applicability of four vehicle delay models for signalized intersections,the experimental environments were designed on the basis of certain traffic demands and signal control.First,the degree of difficulty for using the four vehicle delay models was compared in view of model structure and the number of variables.Then,for the microscopic traffic simulation software VISSIM,the impacts of the travel time section and analysis duration on the measured delay were discussed.Finally,several experimental scenarios were designed according to the cross-classification of the intersection degree of saturation and cycle length.The goodness of fit between each vehicle delay model and the simulation model was investigated.Results show that the Webster model is easy to use and apt to underestimate vehicle delay and its applicability is the worst;the ARRB model is more complex and its applicability is the best;the HCM1985 model is also easy to use and it applicability ismoderate;the HCM2000 model has broad application range but it is too complex,and its applicability is moderate.On the whole,for isolated signalized intersections,the ARRB model displays the best performance in vehicle delay estimation.This research may provide a theoretical basis and reference to the selection of vehicle delay model.