信号交叉口右转车流行程时间计算方法

Calculation method of right-turn vehicle travel time at signalized intersection

为定量研究右转机动车通过信号交叉口的运行效率,以组合负指数分布表征直行非机动车流车头时距,负指数分布表征右转车流车头时距,以可插车间隙理论、排队论为基础建立行程时间模型,并利用实地调查数据,对所建模型与常用的主路车流车头时距服从负指数分布的模型进行对比分析.结果表明:右转车流率、跟随车头时距、临界间隙对行程时间均有显著影响,所提出的右转车流行程时间计算方法有效、适用.

To quantitatively study the operating efficiency of right-turning vehicles at signalized intersection,a travel time model was established on the basis of gap theory and queue theory,which was under the assumption that the straight flow of non-motor headway followed the combined negative exponential distribution and right-turning flow headway followed the negative exponential distribution.Comparison was done by field observation data,and the reasons of the results were analyzed and the applicability of the model was set up.Three significant factors can exert apparent effects on travel time,involving right-turning flow rate,following car headway and critical gap.The travel time model of right-turning vehicles at intersection established in this paper is efficient,practical and with strong applicability.