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                Pennsylvania Develops State-Specific SPFs and CMFs
**Publication Year:** 
            2016
    
        Summary from: Roadway Safety Data Program | Pennsylvania’s State-Specific SPFs and CMFs | FHWA-SA-16-062

			Background

			The Pennsylvania 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 developed district/regional-level calibrations of the State-specific SPFs. PennDOT developed regional SPFs and calibrated State-specific SPFs for use at the regional level. They believe this is the best approach for dealing with the inherent differences among areas within the State.

			The PennDOT Highway Safety and Traffic Operations Division developed a guide on the appropriate use of State-specific crash modification factors (CMFs). This guide is based on a critical review of the CMFs available in the FHWA CMF Clearinghouse to identify CMFs applicable to Pennsylvania. PennDOT’s “Pennsylvania CMF Guide” includes information on these selection criteria as well as best practices to guide practitioners on how to use CMFs appropriately in various scenarios. 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.

			Read the Case Study Pennsylvania’s State-Specific SPFs and CMFs for more detailed information. U.S. DEPARTMENT OF TRANSPORTATION

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