DESCRIPTION OF A COMBINED APPROACH FOR ARTERIAL SIGNAL COORDINATION CONSIDERING BANDWIDTH AND DELAYS (DISCUSSION)
The coordination of traffic lights on arterial streets can be achieved by maximizing the bandwidth or by trying to minimize delays and stops encountered on the artery and on the side streets. Both of these approaches have advantages that are partly retained in a compromise solution, where a green band is selected from among several possible bands so as to cause the least delay to the driver. A first step in this direction is described by giving the outline of a program that analyzes the relation among delays, speeds, offsets, bandwidths, and cycle lengths over a wide range of speeds and cycles. This program can be used by the practitioner to obtain the speed (for a given cycle length) that maximizes the bandwidth, or to determine the cycle (for a given speed) that maximizes bandwidth. It can also be useful to find the offset, speed, or cycle length that causes a reasonable delay to the driver while retaining an acceptable green band. The program that combines bandwidth maximization and delay minimization was applied to five data sets taken from the literature. It was found that the new approach is feasible and could have economic advantages. It was further found that, for low traffic volumes and no platoon dispersion, there is a relation between bandwidth and delays; larger bands generally result in less delay than smaller ones. But as dispersion and traffic volumes increase, this relation no longer holds. It was also strongly confirmed in all cases studied that delays increase with longer cycle lengths for a given value of K = C " V, and it was shown that there is a tendency for increasing delay with increasing cycle length for a given speed on the artery.
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Traffic Signal Systems. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- BAASS, K G
- Allard, B
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Discussers:
- Chang, Edmond C P
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Conference:
- 63rd Annual Meeting of the Transportation Research Board
- Location: Washington District of Columbia, United States
- Date: 1984-1-16 to 1984-1-20
- Publication Date: 1984
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 32-46
- Monograph Title: URBAN TRAFFIC, PARKING, AND SYSTEM MANAGEMENT
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Serial:
- Transportation Research Record
- Issue Number: 957
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Arterial highways; Bandwidth; Offsets (Traffic signal timing); Speed; Traffic delays; Traffic signal control systems; Traffic signal cycle
- Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;
Filing Info
- Accession Number: 00391629
- Record Type: Publication
- ISBN: 030903034
- Files: TRIS, TRB
- Created Date: Jun 30 1985 12:00AM