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Title:

DETECTING FREEWAY INCIDENTS UNDER LOW-VOLUME CONDITIONS

Accession Number:

00099661

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/030902384X

Abstract:

Two computer algorithms for automatic, freeway-incident detection under low-volume conditions were developed. The first approach uses a time-scan process. The second approach, considered to be superior to the first, operates on an event-scan principle. Computer simulations produced a family of curves that are useful in determining sensor- spacing requirements for an operational system using the event-scan algorithm. The results indicate that, when detector spacings of 1,000 ft (304.8 m) are used, all incidents on a 3-lane freeway section can be detected within 3 min for volumes up to 500 vehicles per hour. When volumes approach 1,000 vehicles per hour, 85 percent of the incidents can be detected within 3 min. Faster detection capabilities at the higher volumes would require closer detector spacings. Incident-detection operational considerations, particularly the manner in which software can be developed to recognize and compensate for vehicle-count errors produced by semitrailers and lane-change maneuvers, also are discussed.

Supplemental Notes:

Publication of this paper sponsored by Committee on Freeway Operations. 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.

Monograph Accession #:

01411394

Authors:

Dudek, Conrad L
Weaver, Graeme D
Ritch, Gene P
Messer, Carroll J

Discussers:

Wattleworth, Joseph A; McDermott, Joseph M; PAYNE, HAROLD J

Pagination:

pp 34-47

Publication Date:

1975

Serial:

Transportation Research Record

Issue Number: 533
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

54th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia
Date: 1975-1-13 to 1975-1-17

ISBN:

030902384X

Media Type:

Print

Features:

Figures (6) ; References (15) ; Tables (5)

Uncontrolled Terms:

Incidents

Old TRIS Terms:

Subject Areas:

Administration and Management; Highways; Operations and Traffic Management

Files:

TRIS, TRB

Created Date:

Nov 5 1975 12:00AM

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