The purpose of this standard is to define terms relating to the weights of road vehicles, complete or not, considered under defined conditions. The definitions should make possible a useful comparison of weights applying to similar conditions; they have been drafted taking into account their interest to administrative authorities, manufacturers and users, especially from term 3.7 onwards. This standard should be regarded only as a study in vocabulary. In particular, it specifies neither measurement methods, nor the units to be used to express the results (although SI units should be used for this purpose), nor the precision to be obtained, nor the order of magnitude of the weights defined. The contents of this standard apply to commonly used motor vehicles and to their trailers. They do not apply to - specially designed vehicles, for uses other than carrying of passengers or goods; - motorcycles.