低渠化环形交叉口延误理论模型研究

Study of the Delay Theory Model for Low Channeling Roundabouts

研究环形交叉口的延误,用排队论方法分析低渠化环形交叉口的交通流特性,提出环形交叉口通行能力、延误研究的基本思路,建立单向两进口车道与两环行车道的环形交叉口车流延误模型,得出环形交叉口进口道车流延误时间与自由流比例有关;与行车最小车头时距有关;与环形交叉口通行能力有关;与交叉口车流交织段长度有关。模型对环形交叉口的规划、设计以及服务水平的评价具有指导意义。

A method research of the delay of roundabouts’ capacity is presented in this paper. With the use of queuing theory, this article has analyzed the character of traffic flow in low channeling level roundabouts,and puts forward a basic thought to roundabouts’ capacity and its delay. The delay model which suits to the roundabouts which have two entrances in oneway and two traffic lanes in circular line is set up. Then, we could get the conclusion that the time of roundabouts delay is related to the free flow ratio, the minimum time headway, the roundabouts capability and the length of weaving section. The model is important to plan, design and assess the serve level for roundabouts.