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原文传递 Estimation of U-Turn Capacity at Median Openings

题名：	Estimation of U-Turn Capacity at Median Openings
其他题名：	Aldian,A.,and M.A.P.Taylor.2001."Selecting priority junction traffic models to determine U-turn capacity at median opening."In Vol.3 of Proc.,Eastern Asia Society for Transportation Studies,101-113.
正文语种：	英文
作者：	Smruti Sourava Mohapatra
关键词：	Median opening;Capacity;U-turn;Critical gap;Conflicting traffic volume;Traffic flow
摘要：	Median openings are provided in multilane divided roads to enable U-turns. The atypical conditions prevailing in India motivated this study for the development of a methodology for the proper computation of the capacity for U-turns at these locations. Harders' formula has been widely used by various researchers to evaluate capacity for U-turns and this formula needs three elementary factors-namely, conflicting traffic volume, critical gap, and follow-up time.We collected the required data for capacity estimation from different uncontrolled median openings in India. We estimated the first input parameter required for Harders' formula, conflicting traffic volume, by analyzing the lateral placement of vehicles at the median opening area. We estimated the second parameter, critical gap, by using four different critical gap estimation procedures-namely; modified Raff, maximum likelihood, macroscopic probability equilibrium, and merging behavior. The third parameter, follow-up time, was measured directly in the field. Consequently, we calculated U-turn capacity for the given traffic streams and the findings were tested against the field capacity estimated in the field using Kyte's method.We then determined a suitable method for critical gap estimation in the Indian context by using two statistical parameters.
出版年：	2018
论文唯一标识：	P-72Y2018V144N09009
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/JTEPBS.0000174
期刊名称：	Journal of Transportation Engineering
拼音刊名(出版物代码)：	P-72
卷：	144
期：	09
页码：	68-79