Safety Impacts and Other Implications of Raised Speed Limits on High-Speed Roads

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 90: Safety Impacts and Other Implications of Raised Speed Limits on High-Speed Roads examines how safety, economic, environmental, and commercial conditions on high-speed roadway may be impacted by a change in the speed limit.  Safety-related analyses included in the report were based on a comprehensive framework of the disaggregate relationships between speed limits, driver speed choices, crash occurrence, and crash severity.  An expanded summary of the report has been published as NCHRP Research Results Digest 303.