Study Details

Study Title: Effectiveness of various safety improvements in reducing crashes on Wyoming roadways

Authors: Zebulon C. Coulter Khaled Ksaibati

Publication Date:DEC, 2013

Abstract: 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.

Study Citation: Coulter, Z.C., and Ksaibati, K. Effectiveness of various safety improvements in reducing crashes on Wyoming Roadways. Report Number MPC 13-262. Mountain Plains Consortium. Fargo, North Dakota. (2013).

Study Report: Download the Study Report Document


CMFs Associated With This Study

Category: Roadside

Countermeasure: Install cable median barrier

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.63381 StarCross medianOPrincipal Arterial InterstateRural
0.59412 StarsOtherK,APrincipal Arterial InterstateRural
0.89111 StarOtherB,CPrincipal Arterial InterstateRural
0.79212 StarsOtherK,A,B,CPrincipal Arterial InterstateRural
0.21791 StarCross medianK,APrincipal Arterial InterstateRural
0.63381 StarCross medianB,CPrincipal Arterial InterstateRural
0.36641 StarCross medianK,A,B,CPrincipal Arterial InterstateRural
1.55-552 StarsOtherOPrincipal Arterial InterstateRural

Category:Shoulder treatments

Countermeasure: Install shoulder rumble strips

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
0.9461 StarOtherAllPrincipal Arterial InterstateRural
0.89111 StarOtherK,A,B,CPrincipal Arterial InterstateRural
0.63382 StarsCross medianK,APrincipal Arterial InterstateRural
0.9371 StarCross medianB,CPrincipal Arterial InterstateRural
1.35-352 StarsCross medianOPrincipal Arterial InterstateRural
1.13-131 StarCross medianAllPrincipal Arterial InterstateRural
0.81191 StarCross medianK,A,B,CPrincipal Arterial InterstateRural
01001 StarRun off roadK,APrincipal Arterial OtherRural
0.53472 StarsRun off roadK,APrincipal Arterial InterstateRural
0.5501 StarRun off roadOPrincipal Arterial OtherRural
0.32681 StarRun off roadAllPrincipal Arterial OtherRural
0.18821 StarRun off roadK,A,B,CPrincipal Arterial OtherRural
101 StarOtherK,APrincipal Arterial OtherRural
0.5501 StarOtherB,CPrincipal Arterial OtherRural
0.25751 StarRun off roadOPrincipal Arterial OtherRural
0.3701 StarRun off roadAllPrincipal Arterial OtherRural
0.5501 StarRun off roadK,A,B,CPrincipal Arterial OtherRural
0.75252 StarsRun off roadB,CPrincipal Arterial InterstateRural
1.2-202 StarsRun off roadOPrincipal Arterial InterstateRural
101 StarRun off roadAllPrincipal Arterial InterstateRural
0.69312 StarsRun off roadK,A,B,CPrincipal Arterial InterstateRural
0.44561 StarOtherK,APrincipal Arterial InterstateRural
1.16-161 StarOtherB,CPrincipal Arterial InterstateRural
0.9731 StarOtherOPrincipal Arterial InterstateRural
0.4601 StarRun off roadB,CPrincipal Arterial OtherRural