00460075

Component

http://onlinepubs.trb.org...trr/1986/1057/1057-002.pdf

https://scholar.google.co...ohen&publication_year=1986

The concept of maximizing two-way progression to compute signal-timing plans for signalized arterials has been used for 60 years. One of the unknown questions that exists is how the available two-way band should be apportioned between the two directions of traffic flow. Until now, the two directions have been weighted in proportion to the ratio of the average volume in each direction. However, preliminary studies have indicated that it would be better to apportion the two-way progression bandwidths than to use the volume-ratio criterion alone. Described is a bandwidth weighting algorithm that is based on delay. A simple delay model developed for the PASSER II program was used to estimate delay. Through extensive testing, using the NETSIM model on nine real-world arterial data sets, it was found that three different expressions for the bandwidth ratio should be used; which expression was to be used depended on whether the directional volume ratio was less than 0.45, between 0.45 and 0.55, or more than 0.55. All three expressions involve the ratio of delay in the two directions. A blind test was performed by using six scenarios based on two real-world arterials that were not included in the nine test arterials used for preliminary testing. Based on comparisons using the NETSIM model, the result of this blind test indicated that the weighting algorithm developed in this research generally performed better than both the arbitrary equal-weighting and the MAXBAND average volume-ratio criteria, which have been used up to now.

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

00495950

pp 10-19

1986

Transportation Research Record

0309040515

Print

Figures (8) ; References (20) ; Tables (6)

Algorithms; Bandwidth; Computer programs; Optimization; Ratios; Traffic flow; Traffic signal timing; Traffic volume; Two lane highways; Weighting

Two way traffic

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB

Nov 30 1986 12:00AM

• A TRAFFIC CONTROL SYSTEM FOR THE CITY OF KUWAIT
• CASE STUDY EVALUATION OF THE SAFETY AND OPERATIONAL BENEFITS OF TRAFFIC SIGNAL COORDINATION
• CONGESTION-BASED CONTROL SCHEME FOR CLOSELY SPACED, HIGH TRAFFIC DENSITY NETWORKS
• CONTROL OF CONGESTION AT HIGHLY CONGESTED JUNCTIONS
• DEVELOPING INTERCONNECTION GUIDELINES FOR ISOLATED TRAFFIC SIGNALS
• INVESTIGATION OF OPTIMAL TIME TO CHANGE ARTERIAL TRAFFIC SIGNAL-TIMING PLAN (DISCUSSION AND CLOSURE)
• POTENTIAL PERFORMANCE CHARACTERISTICS OF ADAPTIVE CONTROL AT INDIVIDUAL INTERSECTIONS (ABRIDGMENT)
• THE BANDWIDTH-CONSTRAINED TRANSYT SIGNAL-OPTIMIZATION PROGRAM (DISCUSSION AND CLOSURE)