RHODES-INTEGRATED TRAFFIC MANAGEMENT SYSTEM (ITMS) PROJECT

This report documents the work performed and the results obtained on the RHODES - Integrated Traffic Management System (ITMS) Project. The project addressed the design and development of a real-time traffic adaptive control system for Freeway-Arterial Diamond Interchanges using the concepts underlying the RHODES traffic-adaptive signal control system. The traffic "controls" at a diamond interchange are the two sets of traffic signals located at the arterials, on both sides of the freeway, and the ramp meters at the on-ramps to the freeway. The RHODES-ITMS strategy considers, in real-time, the vehicle arrivals and the queues at the intersections and the on-ramps to optimally set these signals, also in real time, to decrease the overall delay of all the vehicles which use the arterials, the frontage roads parallel to the freeway (if they exist) and the ramps at the interchange. RHODES-ITMS prediction/optimization algorithms (1) predict the arrivals and queues of individual vehicles at the arterial approaches on both sides of the freeway, as well as arrivals from the off-ramps and the departures and queues at the on-ramps, and (2) determine the optimal phasing of the signals at the two intersections on either side of the freeway. To test the algorithms and the RHODES-ITMS strategy, a CORSIM-based simulation model was used. The simulation tests showed that the average vehicle delay is significantly lower for RHODES-ITMS than for the current fully actuated controls; average delays decrease between 25% to 50%. Also, the variance of these delays is drastically reduced. In addition, the simulation tests appear to indicate that RHODES-ITMS probably delays the onset of queue spillback and oversaturated conditions when the traffic volume is very high.

• Corporate Authors:

  University of Arizona, Tucson

  Department of Systems and Industrial Engineering
  Tucson, AZ  United States  85721

  Arizona Department of Transportation

  206 South 17th Avenue
  Phoenix, AZ  United States  85007

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Head, L
  • Mirchandani, P
• Publication Date: 1997-4

Language

• English

Media Info

• Features: Appendices; Figures; References;
• Pagination: 67 p.

Subject/Index Terms

• TRT Terms: Algorithms; Arrivals and departures; Arterial highways; Diamond interchanges; Forecasting; Freeways; Integrated systems; Interchange ramps; Queuing; Real time control; Real time data processing; Traffic control; Traffic delays; Traffic signal timing; Traffic simulation
• Old TRIS Terms: Freeway ramps; Traffic control systems
• Subject Areas: Aviation; Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 00738016
• Record Type: Publication
• Report/Paper Numbers: AZ-SP-9701, Final Report
• Contract Numbers: STP-900-0(088), K93 1973 TRN
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jun 26 1997 12:00AM