A REVIEW OF ROUNDABOUT STUDIES AND NOTE ON THE FLOW LEVELS OF TRAFFIC ENTERING A MINI-ROUNDABOUT

A comprehensive review is given of the literature on mini-roundabouts and on conventional roundabouts both with and without priority rules. Two methods for deriving the capacity of an uncontrolled junction, proposed by Tanner and by Wohl and Martin, are studied using data collected at a mini-roundabout to determine whether the pattern of flows entering the roundabout can be adequately represented knowing the physical layout and the circulating flows. Tanner's method gives a good description of the maximum flows which can enter the roundabout with any given level of flow on the roundabout. The simpler Wohl and Martin's method is found to give some large errors although in a given situation it is possible to reduce these. It is found that, in general, the incorporation of mini- roundabouts in existing procedures for determining optimum signal settings in an area would require the supply of a considerable amount of detailed information which could not be deduced in the case of a proposed mini-roundabout. /Author/

Corporate Authors:
Newcastle-upon-Tyne University, England

Newcastle-upon-Tyne, England
Authors:
- Ferguson, J A
- Papathanassiou, A
Publication Date: 1974-2

Language

English

Media Info

Features: Figures; References;
Pagination: 22 p.

Subject/Index Terms

TRT Terms: Bibliographies; Highway capacity; Strategic planning; Traffic circles; Traffic flow; Traffic signal timing; Travel patterns
Uncontrolled Terms: Traffic patterns
ITRD Terms: 8518: Bibliography; 643: Capacity (road, footway); 9014: Dimension; 455: Junction; 2885: Layout; 648: Priority (traffic); 438: Roundabout; 671: Traffic flow; 565: Traffic signal
Subject Areas: Highways; Operations and Traffic Management;

Filing Info

Accession Number: 00080847
Record Type: Publication
Source Agency: Transport and Road Research Laboratory (TRRL)
Report/Paper Numbers: Working Paper No. 4
Files: ITRD, TRIS
Created Date: May 29 1975 12:00AM