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128 Acronyms and Abbreviations 3R resurfacing, restoration, and rehabilitation AADT annual average daily traffic CMF crash modification factor CPI Consumer Price Index CR reduction in crash frequency DOT department of transportation EB empirical Bayes ECI Employment Cost Index FI fatal and injury HCM Highway Capacity Manual HSIS Highway Safety Information System HSM Highway Safety Manual LOS level of service NHS National Highway System PDO property-damage-only RSAP Roadside Safety Analysis Program SPF safety performance function SSD stopping sight distance veh/day vehicles per day