The design, operation, and effects of a freeway surveillance and control system that became operational near Toronto, Ontario, in July 1975 are described. The system consists of a low-light level closed-circuit television system, microprocessor-based ramp-metering controls, ramp and mainline loop-detector installations, a central traffic-control computer, and a cathode ray tube graphic display. A single broadband coaxial cable is used for both television and two-way data transmission. The system provides traffic-responsive control that is based on both mainline and ramp conditions, incident detection, hardware-status monitoring, and a performance evaluation and reporting capability. The control center is located in a local Ontario Provincial Police facility near the freeway. Operating experience is discussed in terms of the effect of adverse public reaction to ramp metering, driver behavior, and system reliability. Substantial improvements in travel time and freeway speeds have been achieved, even under poor operating conditions, and the accident rate appears to have decreased. The closed-circuit television system has proved to be a valuable tool for traffic and incident management, particularly because of the close interaction with the police. The incident-detection system has been operating satisfactorily but requires verification by using the television system to eliminate false alarms. Overall, the project is considered to be successful. /Authors/

Media Info

  • Media Type: Print
  • Features: Figures; Maps; Photos; References;
  • Pagination: pp 84-93
  • Monograph Title: Urban system operation and freeways
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196605
  • Record Type: Publication
  • ISBN: 0309028272
  • Files: TRIS, TRB
  • Created Date: Sep 15 1979 12:00AM