Evaluation of the Effects of Closing Interstate 5 Lanes and Ramps

This report describes the changes which occurred in traffic volumes, vehicle occupancy rates, and transit ridership as a result of the reconstruction of southbound Interstate 5, north of the Seattle CBD. Available data indicate significant changes in the routes and time of day of travel taken in the morning commute period, but show insignificant changes in the levels of carpooling and transit ridership despite aggressive attempts by local and state agencies to encourage high occupancy vehicle utilization during the reconstruction period.

Publication Date: 
Tuesday, July 1, 1986
Publication Number: 
WA-RD 088.1
Last modified: 
10/12/2016 - 15:41
Mark E. Hallenbeck, Chien Lin.
Washington State Transportation Center (TRAC)
Number of Pages: 
Carpools, Central business districts, Impact studies, Lane closure, Public transit, Ramps (Interchanges), Reconstruction, Ridership, Traffic lanes, Traffic volume, Vehicle occupancy.