United States Department of Transportation
i
The development of local calibration factors - phase II : Maryland freeways and ramps : final report.
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2016-11-01
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[PDF-10.08 MB]
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Edition:Final report
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Abstract:The goal of the study was to develop local calibration factors (LCFs) for Maryland freeways in order to apply the predictive methods of the Highway Safety Manual (HSM) to the state. LCFs were computed for freeway segments, speed-change lanes, and signalized and stop-controlled ramp terminals (intersections of the entrance/exit ramps and the crossroads). Ramps (facilities connecting local roads to freeway travel lanes) and collector-distributor roads were excluded from the study due to insufficient historical crash data. LCFs for the studied facility types were smaller than 1.0, implying on average Maryland had fewer crashes than predicted crashes estimated by the HSM predictive method during the study period. LCFs for ramp terminals were extremely low. Due to potential under-reporting of property damage only (PDO) crashes on ramps, it is recommended that applying LCFs developed with PDO crashes should be done with caution. The report concludes with a discussion on the interpretation of LCFs and data limitations. It should be noted that Baltimore City was not part of this study.
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