Home Skip to main content

Research Reports
Report Details

Title:Effectiveness of Various Safety Improvements in Reducing Crashes on Wyoming Roadways
Authors:Zebulun C. Coulter and Khaled Ksaibati
University:University of Wyoming
Publication Date:Dec 2013
Report #:MPC-13-262
Project #:MPC-318
TRID #:01505602
Keywords:crash data, crash rates, crash severity, highway safety, median barriers, ran off road crashes, rumble strips
Type:Research Report – MPC Publications


The high societal cost of roadway crashes nationwide makes improving highway safety an important objective of transportation agencies. Recognizing this, Safety Management Systems (SMS) have been required by the Federal Highway Administration (FHWA) to encourage states to pursue and promote safety and accident investigations. In 2006, the Wyoming Department of Transportation (WYDOT) SMS Committee organized an effort to reduce the number of fatal and serious injury crashes on Wyoming roadways. A plan was published in a formal document known as the Wyoming State Highway Safety Plan (WSHSP). When developing the WSHSP, the WYDOT SMS Committee recognized four main emphasis areas: roadway departure crashes, use of safety restraints, impaired driving, and speeding. While each one of the four emphasis areas plays an important role in the overall reduction of fatal and serious injury crashes statewide, this research focuses primarily on roadway departure crashes. This research study summarizes the effectiveness of the WSHSP on crash severity statewide. This is done by analyzing crash severity on geometric conditions statewide, as well as the effectiveness of two types of safety devices installed on selected roadway sections: shoulder rumble strips and cable median barriers.

How to Cite

Coulter, Zebulun C., and Khaled Ksaibati. Effectiveness of Various Safety Improvements in Reducing Crashes on Wyoming Roadways, MPC-13-262. North Dakota State University - Upper Great Plains Transportation Institute, Fargo: Mountain-Plains Consortium, 2013.

NDSU Dept 2880P.O. Box 6050Fargo, ND 58108-6050