Recommended Passenger Car Size Definitions and the Need for Vehicle Identification in Traffic Accident Data

Car downsizing has continuously altered the concept and definition of car size. A new set of standard car size definitions has been recommended that provide for either three weight categories (Light: under 2500 lb., Midweight: 2500-3400; Heavy: 3500 and over) or three wheelbase categories (Small = under 100″; Midsize = 100-109, Large = 110 and over). Each classification can be split into six categories or both can be combined into a nine cell cross-classification. It is also recommended that all traffic accident records retain the original VIN and actual vehicle weight and wheelbase, for use in classification and analysis.