Calibrating Crash Modification Factors for Wyoming-Specific Conditions: Application of the Highway Safety Manual, Part D – Phase 2

Ahmed, Mohamed M.; Gaweesh, Sherif; Ahmed, Irfan; Larson, Rachael; University of Wyoming. Department of Civil and Architectural Engineering

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Calibrating Crash Modification Factors for Wyoming-Specific Conditions: Application of the Highway Safety Manual, Part D – Phase 2

2020-02-01
By Ahmed, Mohamed M. ; Gaweesh, Sherif ; Ahmed, Irfan ; ...

[PDF-3.01 MB]

English

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Details:

Creators:

Ahmed, Mohamed M. ; Gaweesh, Sherif ; Ahmed, Irfan ; Larson, Rachael

Ahmed, Mohamed M. ; Gaweesh, Sherif ; Ahmed, Irfan ; Larson, Rachael Less -
Corporate Creators:

University of Wyoming. Department of Civil and Architectural Engineering
Corporate Contributors:

Wyoming. Department of Transportation
Subject/TRT Terms:

[+]

Centerline Rumble Strips Center Lines Crash Modification Factors Diamond Interchanges Divided Highways Four-lane Divided Highway Highway Safety Highway Safety Manual Intersections Raised Road Markings Road Shoulders Roundabouts Rumble Strips Safety Safety Analysis Safety Effectiveness Shoulder Rumble Strips Snow Fences Two Way Left Turn Lanes Variable Speed Limits
Publication/ Report Number:

WY-17/04F Vol 2
Resource Type:

Tech Report
Geographical Coverage:

United States ; Wyoming

United States ; Wyoming Less -
Edition:

Final Report, January 2017-December 2019
Corporate Publisher:

Wyoming. Department of Transportation
Abstract:

The Highway Safety Manual (HSM) provides a quantitative measure of safety of various countermeasures known as Crash Modification Factors (CMF). CMFs provided in the HSM are calibrated based on data collected from a few states with specific roadway and climate characteristics in the US, which may not represent the same safety efficacy of countermeasures implemented in other regions. In this regard, Phase 1 of this project was aimed towards validating the applicability of the HSM to Wyoming conditions. Phase 2 of this project was carried out to fulfil the same objectives with conducting analysis to other countermeasures. The countermeasures which were analyzed in this study included 1) combined shoulder and centerline rumble strips, 2) centerline rumble strips only, 3) adding lane and divide, 4) snow fences, 5) variable speed limit corridors, 6) non-conventional intersections/interchanges (roundabout and diverging diamond interchange), and 7) urban/suburban five lane arterial corridors. Massive data collection efforts have been made to develop crash modification factors. This study provided a set of methodologies to collect and impute data required for the application of the HSM. Moreover, the study verified and confirmed the suitability of other statistical techniques to assess the safety efficacy of countermeasures where data needed are not available. The results indicated that the majority of these countermeasures are statistically significant in reducing crash frequencies and/or severity.
Format:

PDF
Funding:

RS09217
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:629c37af2c7afa36ef97882ff3ce7322534f4b84e590a9f96f349c9f22e0f4ae
Download URL:

https://rosap.ntl.bts.gov/view/dot/54403/dot_54403_DS1.pdf
File Type:

1704F_Rs03216_Crash_Modification_Data_Management_Plan.pdf

pdf

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