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%。
In light of conventional- ly 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.
出处
《城市交通》
2009年第6期71-75,共5页
Urban Transport of China
关键词
交通工程
交通调查
环形交叉口
调查方法
traffic engineering
traf-fic survey
intersection
surveymethods
