Field Evaluation of SCATS Traffic Control in Park City, UT

This paper reports on the field evaluation of the Sydney Coordinated Adaptive Traffic System (SCATS) that was installed in Park City (Utah) in 2005 on its network of 14 signalized intersections. Park City was selected as a deployment site since it is a fast-growing area which often experiences significant shifts in traffic demand due to its frequent recreational and artistic events. SCATS uses information from vehicle detectors, located in each lane immediately in advance of the stop line, to adjust signal timings in response to variations in traffic demand and system capacity. The objective of SCATS deployment was to reduce travel times, vehicle delays, and number of stops in the network. The evaluation compared previous time-of-day actuated-coordinated signal timings with those dynamically computed by SCATS. Travel times, travel time stopped delay and number of stops were collected by driving probe vehicles on the major routes. Travel time stopped delay was measured as stopped time experienced during the travel time runs, mostly due to waiting at traffic signals. Information on intersection stopped delays was also collected to investigate traffic performance on side streets. Overall, SCATS consistently reduced travel times and travel time stopped delay, lessened the average number of stops, and lowered intersection stopped delay for major and minor through movements of traffic. In addition, the SCATS installation is expected to reduce operational costs to maintain proper signal timings and coordination on the Park City network.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 12p
  • Monograph Title: ITS Connections: Saving Time. Saving Lives

Subject/Index Terms

Filing Info

  • Accession Number: 01142416
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 12 2009 11:20AM