Recommended Citation
Tarko, A. P., Romero, M., Lizarazo, C., & Pineda, R. (2020). Statistical analysis of safety improvements and integration into project design process (Joint Transportation Research Program Publication No. FHWA/IN/JTRP-2020/09). West Lafayette, IN: Purdue University. https://doi.org/10.5703/1288284317121
DOI
10.5703/1288284317121
Abstract
RoadHAT is a tool developed by the Center for Road Safety and implemented for the INDOT safety management practice to help identify both safety needs and relevant road improvements. This study has modified the tool to facilitate a quick and convenient comparison of various design alternatives in the preliminary design stage for scoping small and medium safety-improvement projects. The modified RoadHAT 4D incorporates a statistical estimation of the Crash Reduction Factors based on a before-and-after analysis of multiple treated and control sites with EB correction for the regression-to-mean effect. The new version also includes the updated Safety Performance Functions, revised average costs of crashes, and the comprehensive table of Crash Modification Factors—all updated to reflect current Indiana conditions. The documentation includes updated Guidelines for Roadway Safety Improvements. The improved tool will be implemented at a sequence of workshops for the final end users and preceded with a beta-testing phase involving a small group of INDOT engineers.
Report Number
FHWA/IN/JTRP-2020/09
Keywords
roadway safety, safety management, scoping projects, crash modification factors
SPR Number
4216
Performing Organization
Joint Transportation Research Program
Sponsoring Organization
Indiana Department of Transportation
Publisher Place
West Lafayette, Indiana
Date of this Version
2020