Wednesday, May 11, 2016

WSDOT Decides Against Increasing I90 Speed Limit

The Washington State Department of Transportation, Washington State Patrol and Washington Traffic Safety Commission announced today that, due to safety concerns, they will not increase the speed limit on Interstate 90 in eastern Washington.

The original proposal was to increase the speed limit from 70 to 75 mph along roughly 100 miles of I-90 starting near George to the Lincoln/Spokane county line. Analysis found the increased risks and costs associated with the proposed change outweighed the projected time savings.

In particular, analysis of the roadway, crash history, current speeds and other states’ experiences predicted an additional 1.27 fatal or serious crashes annually if the speed limit was raised. A higher speed limit also would bring an estimated $8.3 million in additional annual safety costs, the analysis found.

The review also found that raising the speed limit to 75 mph would save just an estimated five minutes on a 100-mile trip, with an estimated annual value of $3.6 million in time saved.



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About SRTC

SRTC is the federally designated Metropolitan Planning Organization (MPO) for Spokane County. Urbanized areas with populations exceeding 50,000 people are required to have an MPO. SRTC was formed to address the county's transportation planning needs. It provides coordination in planning between the public, cities, small towns, the county, the state, transit providers, and tribes.

SRTC offers services including transportation monitoring, transportation modeling, census information analysis, travel demand forecasting, historical traffic count analysis, geographic information systems, and trip generation rates.