详情

原文传递 INFLUENCE OF ROUNDABOUT SIZE AND CIRCULATING TRAFFIC FLOW ON CRITICAL GAPS, FOLLOW-UP TIMES AND SPEEDS

题名：	INFLUENCE OF ROUNDABOUT SIZE AND CIRCULATING TRAFFIC FLOW ON CRITICAL GAPS, FOLLOW-UP TIMES AND SPEEDS
其他题名：	1.Brilon,2011.Studies on roundabouts in Germany:lessons learned,in:3rd International Conference on Roundabouts.Carmel,Indiana,May 18-20,pp.1-15.
正文语种：	英文
作者：	Abdullah Ahmad
关键词：	Roundabout;Critical gap;Follow-up time;Speeds;India
摘要：	Estimation of critical gaps and follow-up times is tedious under mixed traffic conditions on roundabouts. The roundabouts are designed for a speed of 30 km/h. If the operating speeds go down than this then that can be treated as a performance measure. This paper estimates the critical gaps, follow-up times and speeds for cars and motorized two wheelers on two roundabouts of different central island diameters and tries to examine the effect of circulating traffic flow and size of the central island diameter on variation in these values. Two roundabouts, with central-island diameter 25 m and 37 m, were selected in Chandigarh city, India. The inventory and traffic data were collected on the roundabouts. Gaps accepted and rejected by entering vehicle have been extracted by vehicle type. These are used to estimate critical gap by using maximum likelihood method. Estimated values of critical gaps and follow-up-times are found to be different than those adopted in developed countries like U.S. and European countries. The critical gaps and follow-up times are not found varying with the change in circulating traffic flow. The critical gap and follow-up time are found decreasing with an increase in the diameter of the central-island. Speed of the vehicles at entry and within circulating area are found higher for larger diameter roundabout than the smaller diameter roundabout.
出版年：	2017
论文唯一标识：	I-75Y2017V45N01007
英文栏目名称：	TECHNICAL PAPERS
期刊名称：	Indian Highways
拼音刊名(出版物代码)：	I-75
卷：	45
期：	01
页码：	37-48