Cars on the freeway in a desert setting
Feb 20, 2019
Principal Investigator: Christopher Monsere, Portland State University
Learn more about this research by viewing the full Final Report on the Project Overview page.

A new report by Christopher Monsere and Sirisha Kothuri, researchers in Portland State University's department of civil and environmental engineering, found a direct correlation between increased speed limits and an increase in serious crashes in Eastern Oregon. The Oregon Department of Transportation (ODOT) funded the study examining issues related to changes in posted speed limits.

Speed limits on approximately 1,400 miles of highways and interstates in Eastern Oregon were increased by the Oregon legislature effective March 1, 2016. Using four years of data, Monsere, Kothuri and researcher Jason Anderson examined speeds in relation to crash frequency and severity from the year after the speed limits increased compared with the three previous years. On sections where the speed limit was raised to 65 mph for trucks (primarily the interstates), truck-involved crashes more than doubled.

In response to this study, ODOT is already taking some safety measures after PSU’s analysis. Learn more in the East...

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