MEASURES OF THE SENSITIVITY AND EFFECTIVENESS OF THE CORQ TRAFFIC MODEL

The traffic simulation model on corridor queuing, CORQ, was tested and used to predict the effects of some alternative traffic control schemes designed to relieve and bottleneck on the Ottawa Queensway. For each control scheme CORQ predicted the link flows and queues as well as the total travel time for the entire Queensway corridor. The corridor was modeled as a network of nodes and links. Demands were represented by a set of origin-destination matrices corresponding to a sequence of 15-min time sections, each of which had assumed time-stationary demand rates. The CORQ model assigned these demands to the network and was found to reproduce measured flows and queues reasonably will. It then was calibrated to measured values and used to predict the flows, queues, and total travel time for each of the various control schemes. The model was found to be sensitive to a variety of strategies including the metering or closure or both of freeway ramps, revised red-green splits at traffic signals, and restriping or channelization. In this particular application, CORQ predicted that the closure of a certain off ramp would have the greatest single effect on total network travel time. CORQ does not account for the feedback effect on corridor origin-destinaton demands because of new operating conditions caused by traffic controls. The user is left to alter the origin-destinationmatrices to account for those demand changes that he or she feels are required.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1976/562/562-004.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=MEASURES+OF+THE+SENSITIVITY+AND+EFFECTIVENESS+OF+THE+CORQ+TRAFFIC+MODEL&author=S.+Yagar&publication_year=1976
• Availability:
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Effectiveness of Operational Measures. 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.
• Authors:
  • Yagar, Sam
• Conference:
  • 54th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia
  • Date: 1975-1-13 to 1975-1-17
• Publication Date: 1976

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 38-48
• Monograph Title: Measures of Effectiveness, Railroad-Highway Grade Crossings, and Visibility
• Serial:
  • Transportation Research Record
  • Issue Number: 562
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Measures of effectiveness; Network analysis; Progressive traffic signal control; Queuing; Ramp metering; Sensitivity; Traffic control; Traffic flow; Traffic simulation; Travel demand; Travel time
• Uncontrolled Terms: Effectiveness; Network flows
• Old TRIS Terms: Traffic control systems
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00134867
• Record Type: Publication
• ISBN: 0309024722
• Files: TRIS, TRB
• Created Date: Sep 4 1976 12:00AM