文章编号： 1672-5328（2013）03-0091-04

Vikash V. Gayah1 著，王志高2 译
（1. 宾夕法尼亚州立大学，美国宾夕法尼亚16802；2. 宇恒可持续交通研究中心，北京100004）

摘要： 为了改善机动车的可达性 并避免驾驶人迷失，城市政府和规 划师开始将中心城区传统的单向 道路网络转换成双向行驶。双向 道路网络可提升经济活力水平和 中心城区的宜居性，而单向道路网 络可提高通行能力。指出使用出 行服务能力指标来衡量道路网络 效率更适宜，将单向行驶与双向行 驶道路网络的出行服务能力进行 对比，后者交叉口的处理包括左转 专用车道、左转渠化和禁止左转三 种方式。结果显示，与传统认知和 设计手册相反，双向道路网络通常 比单向道路网络更有效率。在出 行距离较短的情况下，允许转向的 双向道路网络比单向道路网络的 出行服务能力更高；禁止左转的双 向道路网络比单向道路网络造成 的绕行更少。

关键词： 道路网络；双向道路；单向 道路；道路通行能力；道路网络效 率；出行服务能力；禁止左转

中图分类号：U491

文献标识码：A

Written by Vikash V. Gayah1, Translated byWang Zhigao2
(1. Pennsylvania State University, Pennsylvania 16802, USA; 2. China Sustainable Transportation Center, Beijing 100004, China)

Abstract： To improve vehicular access and reduce driver confusion, city officials and urban planners have started a movement to convert downtown street networks from traditional one-way operation to two-way operation. Two-way street networks increase economic activity and livability, while one-way street networks increase vehicle flow. This paper points out that trip-servicing capacity is a better metric of network efficiency. Then the paper compares the trip-serving capacities of various one-way networks and two-way networks with: left-turn lanes, left-turn pockets, and banned left turns. The results show that contrary to conventional wisdom and design handbooks, two-way networks are often more efficient than one-way networks. When trips are short, two-way networks have higher trip-serving capacities than one-way networks. Meanwhile, two-way networks with banned left turns impose less circuity than one-way networks.

Keywords： street network; two-way street; one-way street; vehicle-moving capacity; trip-serving capacity; banned left turns