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Effectiveness of Nighttime Speed Limit Reduction in Reducing Wildlife-Vehicle Collisions

Started: December, 2016 End Date: December, 2018 Project ID #4w6435 Status: Ongoing


The objective of this project is to provide transportation planners with information about whether reducing nighttime speed limits is an effective means of reducing vehicle collisions with wildlife, which is a mitigation measure under consideration in some western states.


The Wyoming Department of Transportation is interested in testing and developing a broad range of methods for reducing wildlife vehicle collisions.  One possible mitigation measure is to reduce posted speed limits in areas known to have high wildlife-vehicle collision rates, particularly at night when the majority of collisions occur. There is a need to understand whether such measures would be effective in reducing  WVCs, and whether they would be more effective under some circumstances than others. Through this project, WTI will investigate the effects of  speed limit reductions at mule deer collision hotspots in Wyoming.  Researchers will study the effects of the speed limits on vehicle speeds, on the interactions between wildlife and vehicles, and on the number of observed collisions.


Sponsors & Partners

  • Northern Rockies Conservation Cooperative Sponsor

Part of: Road Ecology, Wildlife

Project Tagged In: speed limits, wildlife-vehicle collisions

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