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40 Acronyms and Abbreviations AADT annual average daily traffic AF SPF adjustment factor CMF crash modification factor CMFunction crash modification function CPM crash prediction model EB empirical Bayes GLM generalized linear model HSIS Highway Safety Information System HSM Highway Safety Manual HSM1 Highway Safety Manual, 1st edition HSM2 Highway Safety Manual, 2nd edition HSRC Highway Safety Research Center (University of North Carolina) KABCO injury scale in which K = fatal (killed), A = incapacitating injury, B = nonincapacitating injury, C = possible injury, and O = property damage only PDO property damage only RTM regression to the mean SPF safety performance function SVROR singleÂvehicle run off road TWLTL twoÂway leftÂturn lane
