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原文传递 Design Guidelines for Symmetrical Single-Lane Roundabouts Based on Intersection Sight Distance

题名：	Design Guidelines for Symmetrical Single-Lane Roundabouts Based on Intersection Sight Distance
其他题名：	Harwood,D.W.,Mason,J.,Brydia,R.,Pietrucha,M.,and Gittings,G.(1996)."Intersection sight distance."National Cooperative Highway Research Program Rep.383,Transportation Research Board,Washington,DC.
正文语种：	英文
作者：	Said M. Easa
关键词：	Roundabouts; Intersection sight distance; Lateral clearance; Crosswalks; Field of vision
摘要：	Checking roundabout sight distance is currently performed graphically. This paper develops analytical models for lateral clearance at symmetrical single-lane roundabouts based on intersection sight distance (ISD) and establishes related geometric design guidelines. The models are developed for two cases: an approach vehicle ahead of the yield line and before the crosswalk (Case 1), and a stationary vehicle at the yield line (Case 2). Sight distances to the respective conflicting-circulating and entering vehicles are analyzed. The maximum lateral clearance is formulated for each case using mathematical optimization. The results show that both cases of the approach and stationary vehicles are critical and therefore should be included in the ISD analysis at roundabouts. Using the developed models, design guidelines are established for the radius of the central island, entry-curve lateral clearance, exit crosswalk location, and driver's field of peripheral vision.
出版年：	2017
论文唯一标识：	P-72Y2017V143N10005
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/JTEPBS.0000081
期刊名称：	Journal of Transportation Engineering
拼音刊名(出版物代码)：	P-72
卷：	143
期：	10
页码：	29-39