Affiliation:
1. Queensland University of Technology, P.O. Box 2434, Brisbane 4001, Australia
Abstract
The background to the Highway Capacity Manual (HCM) section on the analysis of the performance of roundabouts is discussed. The paper has two main objectives: to discuss the background of different techniques used to evaluate the level of service and to describe the method included in the HCM. The paper is in two parts. In the first part, the first objective is addressed and the parameters needed to predict both delay and capacity, which in turn are used to evaluate the level of service, are described. It is concluded that the gap acceptance approach is a reasonable one when the performance of roundabouts is predicted using data from uncongested sites. If there are a significant number of roundabouts with congested approaches, an empirical model should be used. It is also concluded that the results from one country cannot be immediately transferred to another. In the second part of the paper, the recommended practice included in HCM Chapter 10 is given.
Subject
Mechanical Engineering,Civil and Structural Engineering
Reference24 articles.
1. Special Report 209: Highway Capacity Manual (1997 update). TRB, National Research Council, Washington, D.C., 1998, Cha p. 10.
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