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(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
---|
0.63 | 38 | | Cross median | O | Principal Arterial Interstate | Rural |
0.59 | 41 | | Other | K,A | Principal Arterial Interstate | Rural |
0.89 | 11 | | Other | B,C | Principal Arterial Interstate | Rural |
0.79 | 21 | | Other | K,A,B,C | Principal Arterial Interstate | Rural |
0.21 | 79 | | Cross median | K,A | Principal Arterial Interstate | Rural |
0.63 | 38 | | Cross median | B,C | Principal Arterial Interstate | Rural |
0.36 | 64 | | Cross median | K,A,B,C | Principal Arterial Interstate | Rural |
1.55 | -55 | | Other | O | Principal Arterial Interstate | Rural |
Category:Shoulder treatments
Countermeasure: Install shoulder rumble strips
CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
---|
0.94 | 6 | | Other | All | Principal Arterial Interstate | Rural |
0.89 | 11 | | Other | K,A,B,C | Principal Arterial Interstate | Rural |
0.63 | 38 | | Cross median | K,A | Principal Arterial Interstate | Rural |
0.93 | 7 | | Cross median | B,C | Principal Arterial Interstate | Rural |
1.35 | -35 | | Cross median | O | Principal Arterial Interstate | Rural |
1.13 | -13 | | Cross median | All | Principal Arterial Interstate | Rural |
0.81 | 19 | | Cross median | K,A,B,C | Principal Arterial Interstate | Rural |
0 | 100 | | Run off road | K,A | Principal Arterial Other | Rural |
0.53 | 47 | | Run off road | K,A | Principal Arterial Interstate | Rural |
0.5 | 50 | | Run off road | O | Principal Arterial Other | Rural |
0.32 | 68 | | Run off road | All | Principal Arterial Other | Rural |
0.18 | 82 | | Run off road | K,A,B,C | Principal Arterial Other | Rural |
1 | 0 | | Other | K,A | Principal Arterial Other | Rural |
0.5 | 50 | | Other | B,C | Principal Arterial Other | Rural |
0.25 | 75 | | Run off road | O | Principal Arterial Other | Rural |
0.3 | 70 | | Run off road | All | Principal Arterial Other | Rural |
0.5 | 50 | | Run off road | K,A,B,C | Principal Arterial Other | Rural |
0.75 | 25 | | Run off road | B,C | Principal Arterial Interstate | Rural |
1.2 | -20 | | Run off road | O | Principal Arterial Interstate | Rural |
1 | 0 | | Run off road | All | Principal Arterial Interstate | Rural |
0.69 | 31 | | Run off road | K,A,B,C | Principal Arterial Interstate | Rural |
0.44 | 56 | | Other | K,A | Principal Arterial Interstate | Rural |
1.16 | -16 | | Other | B,C | Principal Arterial Interstate | Rural |
0.97 | 3 | | Other | O | Principal Arterial Interstate | Rural |
0.4 | 60 | | Run off road | B,C | Principal Arterial Other | Rural |