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Recommended Congestion Monitoring Options for WSDOT: Final Phase I Summary Report

Description: This is a summary of the results of Phase I for this project. It recommends a two-tiered congestion monitoring system for use in the State of Washington. In uncongested areas of the state it recommends use of volume/capacity ratios to estimate congestion levels. For congested roads, travel time measures are recommended. In addition to these measures, additional data items (mode choice, vehicle volumes, average vehicle occupancy, etc.) are also needed to measure congestion.


  • Date Published: September, 1994
  • Publication Number: WA-RD 317.1
  • Last Modified: October 22, 2007
  • Author: Mark E. Hallenbeck.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 28 p., 646 KB (PDF)
  • Subject: Data collection, Highway capacity, Highway traffic control, Monitoring, Traffic congestion, Traffic measurement, Traffic surveillance, Traffic volume, Travel time.
  • Keywords: Congestion monitoring, traffic monitoring, congestion management systems, Washington (State)
  • Related Publications: Recommended Congestion Monitoring Options for WSDOT: Final Report, (WA-RD 317.2).

This abstract was last modified April 29, 2008