文章编号：1672-5328（2009）06-0071-05

仲小飞，马健霄，马亮
（南京林业大学汽车与交通工程学院，江苏南京210037）

摘要：为了系统而简便地获取5 路环形交叉口分流向的交通量，在 分析传统的记录车牌号法和交织 断面调查法的基础上，设计了针对 5 路环形交叉口交通量的卡片调 查法。调查方法为利用不同颜色 的卡片标记从某一进口流向其他 出口的抽样车辆，计算右转交通量 的理论比例；记录所有进出口交通 量和右转交通量，得到右转交通量 的实际比例。根据调查量求解约 束方程，可得到各进口分流向的交 通量。以南京市新庄立交为例，运 用该方法调查，计算底层平面环形 交叉口各进口分流向的交通量。 结果表明，在抽样率为5%时，右转 交通量理论比例与实际比例的最 大误差为9.16%。

关键词：交通工程；交通调查；环形 交叉口；调查方法

中图分类号：U491.1+1

文献标识码：A

A Traffic Survey Method for 5-Leg Roundabouts

ZHONG Xiao-fei, MAJian-xiao, MALiang
(College of Automobile and Traffic Engineering of Nanjing Forestry University, Nanjing Jiangsu 210037, China)

Abstract：In light of conventionally used methods for weaving traffic survey, such as license-plate and cross-sectional surveys, this paper proposes a new method to systematically and handily obtain traffic volumes entering each approach of a 5-leg roundabout. The method utilizes cards of various colors to register a sample of vehicles traveling from one approach to all exits, and thus derives the theoretical percentage of right-turn traffic; then, through the total volume and the right-turn volumes observed at all approaches, the method obtains the actual percentage of right-turn traffic. Given the above data, the survey applies a constrained equation to calculate traffic distributions from one approach to each exit. As an example, the paper demonstrates an application of the new method to observing traffic at the ground tier circle of the interchange at Xinzhuang Rd., Nanjing. From a 5% sample, the results show a discrepancy of 9.16% between ratios of theoretical and actual right turn volumes.

Keywords：traffic engineering; traffic survey; intersection; survey methods