The purpose of this American National Standard is to provide a common language for reporters, classifiers, analysts, and users of traffic accident data. The Manual on Classification of Motor Vehicle Traffic Accidents and its predecessor, Uniform Definitions of Motor Vehicle Accidents, have provided classification assistance for more than half a century. The Manual is designed to facilitate the development of data on accidents involving motor vehicles and other road vehicles in and out of traffic. It is a standard for statistical classifications of motor vehicle traffic accidents for the US.