In Puget Sound, variable tolling on SR-167 made more efficient use of carpool lanes without delaying buses; average speeds in general purpose lanes increased by 21 percent while average speeds in HOT lanes increased by 6 percent.
Detailed performance data were collected after the facility opened in May 2008. Annual evaluation reports were provided to the State legislature and Transportation Commission.
Performance analysis measured average peak period traffic conditions from May to November 2009, and the findings were compared to the same period in 2007. The following results were reported. (Note: Results from 2008 were omitted due to conflicting construction projects.)
General Purpose Lane (Speed and Volume)
- Average speeds increased by 21 percent (from 40 mi/hr to 49 mi/hr).
- Average traffic volume increased by 11 percent.
- Average speeds increased by 6 percent (from 57 mi/hr to 61 mi/hr).
- Average traffic volume increased by 4 percent northbound and 1 percent southbound.
Bus ridership in the corridor increased greatly from 2007 to 2008 as gas prices peaked in the summer of 2008. Fewer rode the bus in 2009 following the reduction in gas prices, economic instability, and regional job loss. The trend was consistent throughout south King County and Pierce County.
Published By: Washington State DOT
Source Date: Winter 2009/2010URL: http://www.wsdot.wa.gov/NR/rdonlyres/C65EF247-C517-41D9-A4B1-AC0463082CA2/67034/HOTLanesUpdateFINAL.pdf
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