详情

原文传递 Geometric Characteristics of Roundabouts with Offset and Skewed Approaches

题名：	Geometric Characteristics of Roundabouts with Offset and Skewed Approaches
正文语种：	eng
作者：	Said M. Easa;Qing Chong You
作者单位：	Dept. of Civil Engineering Toronto Metropolitan Univ. Toronto ON Canada M5B 2K3;WSP Canada Inc. 100 Commerce Valley Dr. West 4th Floor Thornhill ON Canada L3T 0A1
关键词：	Roundabouts; Skewed approaches; Offset approaches; Approach alignments; Skew angles; Offsets
摘要：	Roundabouts are a superior solution to traffic operation issues at intersections with complex geometry, such as skewed and offset approaches where there are property constraints or where realigning approaches is costly. Although roundabouts with offset, skewed approaches are unavoidable, the current design standards are typically established based on standard roundabouts having radial approach alignments and perpendicular approaches. This work aimed to (1) examine the geometric characteristics of roundabouts with offset or skewed approaches or both, (2) establish the relationships of the design parameters with the approach offset and angle, (3) develop geometric optimization models, and (4) recommend geometric design guidelines for inscribed circle radius, entry curve radius, and exit curve radius. The approach or intersection angle ranges are also recommended for single-lane and two-lane roundabouts under urban and rural conditions. Design graphs and tables of the minimum required radii were developed. They not only help highway designers and engineers to select the appropriate parameters and reduce trial-and-error efforts during design, but also offer a guide to property needs during the planning stage.
出版年：	2023
期刊名称：	Journal of Transportation Engineering
卷：	149
期：	7
页码：	04023061.1-04023061.15