Central Puget Sound Freeway Network: Usage and Performance

This summary report presents an overview of the level of traveler usage (e.g., how many vehicles use the freeways) and travel performance (e.g., how fast they are traveling, where and how often congestion occurs) on the principal urban freeways in the central Puget Sound area for 1997. Data presented in this report were collected by the Washington State Department of Transportation's (WSDOT's) freeway surveillance system. The project that led to this report is intended to meet two separate purposes:  1)  to enhance WSDOT's ability to monitor and improve its traffic management efforts on Seattle-area highways, and 2)  to provide useful information to the public and decision makers about the status of the freeway system's operational performance. This report is primarily intended to meet the second purpose of these objectives. However, the software developed for this project and many of the graphics presented in this report are directly applicable to the first objective. The freeways studied in this project are managed by WSDOT using its FLOW system, a coordinated network of traffic monitoring, measuring, information dissemination, and control devices that operates on urban state and Interstate highways in the central Puget Sound region.

Publication Date: 
Monday, March 1, 1999
Publication Number: 
WA-RD 466.1
Last modified: 
09/20/2018 - 12:23
John M. Ishimaru, Mark E. Hallenbeck.
Washington State Transportation Center (TRAC)
Number of Pages: 
Freeways, High occupancy vehicle lanes, Highway traffic control, Monitoring, Performance, Traffic congestion, Traffic speed, Traffic surveillance, Traffic volume, Urban areas.