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227 A C R O N Y M S AADT: annual average daily traffic AASHTO: American Association of State Highway and Transportation Officials AF: adjustment factor ATR: automatic traffic recorder CMF: crash modification factors CPM: crash prediction model DOT: state department of transportation D-PTSU: dynamic part-time shoulder use FHWA: Federal Highway Administration FI: fatal-and-injury FP: fixed parameter HCM: Highway Capacity Manual HOT: high-occupancy toll HOV: high-occupancy vehicle HSIS: Federal Highway Administration's Highway Safety Information System HSM Supplement: Highway Safety Manual Supplement HSM: Highway Safety Manual LC: latent class NCHRP: National Cooperative Highway Research Program PDO: property-damage-only PTSU: part-time shoulder use RP: random parameter SDF: severity distribution function SPF: safety performance function S-PTSU: static part-time shoulder use VSL: variable speed limit
