Pennsylvania's State-Specific SPFs and CMFs: Roadway Safety Data and Analysis Case Study

2016Strawder, EstherPDFTech ReportFHWA-SA-16-062DTFH61-10-D-00022Crash modification factorsSafety managementData analysisHighway safetyCase studiesUnited StatesUnited States. Federal Highway Administration. Office of SafetyScopatz, Robert A.Smith, Sarah M.United States. Federal Highway Administration. Office of SafetyVHB/Vanasse Hangen Brustlin, Inc.Strawder, EstherFederal Highway AdministrationPennsylvania Department of Transportation (PennDOT) used Part C of the Highway Safety Manual (HSM) to develop State-specific safety performance functions (SPFs). For some facility types, PennDOT calibrated the SPFs at the district or regional level within the State. PennDOT believes that pre-selecting applicable CMFS, and developing State-specific and regionally calibrated SPFs offers the best approach for addressing the State\u2019s unique features and for dealing with the inherent differences among areas within the State. As the list of countermeasures in the CMF Clearinghouse continues to grow, practitioners can use the criteria to select from among the newly added CMFs.84