文章编号：1672-5328（2007）05-0026-05

程伟力¹ 李开国² 叶彭姚¹
（1.同济大学交通运输工程学院，上海 200092； 2.上海市道路交通研究中心，上海 200092）

摘要：合理组织平面交叉口中的左转车流问题，与行车安全和通行能力有直接关系。禁止左转是平面交叉口组织的一个重要方式，它可能带来的交通效应与多种因素有关。从左转的交通特性出发，研究禁止左转后交叉口延误变化的机理和交通流的重新组织方式，得到禁止左转后交叉口延误变化的计算模型。通过模型分析认为，交叉口饱和度、路网密度和左转车流比例是影响交通效应的重要边界条件，并分析了这些边界条件对于禁止左转产生效应的影响方式。

关键词：平面交叉口；禁止左转；效应；冲突

中图分类号：U491.2⁺3

文献标识码：A

Analysis of Effects of Left-Turn Prohibitions on at-grade Intersections

GHENG Weili¹, LI Kaiguo² and YE Pengyao¹
(1.Transportation School of Tongji University , Shanghai 200092; 2.Shanghai Road and Traffic Research Center, Shanghai 200092)

Abstract: Reasonably organizing the left-turn flow at the at-grade intersection can directly impact the driving safety and road capacity. Left-turn prohibition is an important approach to organizing the surface intersection, and its effects are relevant to many factors. Based on the characteristics of the left-turn traffic flow, this paper analyzes the mechanism of intersection delay change after the left-turn is prohibited. Through reorganization of the traffic flow while left-turn is prohibited, a computing model for intersection delay change is developed. Through the modeling analysis, it finds out some important boundary conditions including intersection saturation, network density and left- turn ratio. Meanwhile the paper analyzes the way these boundary conditions impact on the left-turn prohibition effects.

Keywords: level intersection; left-turn prohibition; effect; conflict