CORQ-A MODEL FOR PREDICTING FLOWS AND QUEUES IN A ROAD CORRIDOR

A procedure has been developed for predicting the self-assignment of time-varying traffic demands in a network. The procedure's computer program, CORQ, has been used to validate and apply the model in a real corridor. It is intended as a tool to enable the traffic analyst to assess the systemwide effects of any traffic-control strategies proposed for a network as long as the total system's demands remain invariant or at least have a predictable response to the controls. The model has been specialized to give detailed treatment to the critical elements of a corridor that affect traffic flow, capacity, queuing, and delays. It can be used for a form of microanalysis of areas that are about 500 blocks large. For these cases it considers only the major intersections, freeway interchanges, and their surface-street links but gives them a detailed treatment. It can be used for much larger areas if only the freeway network needs to be modeled. Time-varying traffic controls can be simulated. CORQ also can serve as a partial optimization technique by selecting metering rates that fully use the capacity of a merge without queuing on the freeway. CORQ is intended for use in estimating quantitatively the effects of various types of traffic control strategies before a commitment to any specific control schemes and installation of specialized hardware. It can serve as a traffic-management game, and it has been used in training students in the design of traffic-engineering and traffic-control schemes including ramp closure, ramp metering, restriping, and altering traffic-signal splits.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1975/533/533-006.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=CORQ-A+MODEL+FOR+PREDICTING+FLOWS+AND+QUEUES+IN+A+ROAD+CORRIDOR&author=S.+Yagar&publication_year=1975
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/030902384X
• 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.
• 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: 1975

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 77-87
• Monograph Title: Freeway Entry, Flow, and Control
• Serial:
  • Transportation Research Record
  • Issue Number: 533
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Computer programs; Corridors; Forecasting; Freeways; Highway capacity; Highway traffic control; Interchanges; Intersections; Mathematical models; Optimization; Queuing; Ramp metering; Traffic control; Traffic delays; Traffic flow
• Uncontrolled Terms: Models
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00099664
• Record Type: Publication
• ISBN: 030902384X
• Files: TRIS, TRB
• Created Date: Nov 5 1975 12:00AM