00714913

Component

http://onlinepubs.trb.org...trr/1995/1494/1494-021.pdf

https://scholar.google.co...abis&publication_year=1995

Two deterministic methods for assessing delay and queue length consequences of bus preemption at signalized intersections are presented. The procedures are adapted from queueing theory and address three types of preemption strategies: green extension, red truncation, and red interruption. Method 1 macroscopically simulates groups of vehicles at the intersection using regular signal timing and timing under preempted conditions. Method 2 uses microscopic simulation in which each vehicle is treated individually and traffic flow patterns are evaluated for the regular signal timing and timing under preemption condition. Both methods are applied to three intersections in Ann Arbor, Michigan, representing different volume levels at the cross street. Data on vehicle arrival, service, queue lengths, and delays were compiled from videotapes made at the intersections during the spring of 1994. The algorithms developed were used to assess changes in queue lengths and delays resulting from the revised signal timing. The two methods appear to be viable tools for evaluating traffic flow consequences of preemption. The case studies indicate some variations in the results between the intersections representing different volume levels. Method 2 (microscopic) is preferred for lighter volume levels, and Method 1 (macroscopic) should be used for higher volume levels. Further research is recommended to validate the proposed methods.

This paper appears in Transportation Research Record No. 1494, Traffic Operations, Traffic Signal Systems, and Freeway Operations 1995. 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

01399825

English

p. 167-175

1995

Transportation Research Record

Figures (2) ; References (8) ; Tables (12)

Algorithms; Bus priority; Case studies; Field studies; Macroscopic traffic flow; Microscopic traffic flow; Queuing; Signalized intersections; Simulation; Traffic delays; Traffic signal timing; Traffic simulation; Traffic volume; Videotapes

Field data; Macroscopic simulation; Queue length

Ann Arbor (Michigan)

Highways; Operations and Traffic Management; Public Transportation; I73: Traffic Control

TRIS, TRB, ATRI

Dec 13 1995 12:00AM

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