URBAN ROAD CLASSIFICATION AND LOCAL STREET FUNCTION

Based on notes written for workshop and seminar participants, the paper focuses on the problem of identifying the functions of roads as a basis for local traffic management schemes and planning new or modified local networks. The conventional terminology usually encountered in Australian practice is identified, and its essential characteristics - that road systems are tributary in character, and that each class is defined by a balance of traffic and access functions - are queried. Conflicts between functions result, even on local streets. In comparison, the two-class separate-function system of classification stresses that any level of traffic distributor must serve minimal access functions, and vice versa. The practical application of such a concept to new and existing networks is discussed. It is suggested that new development should not follow the conventional 'balanced-functions' model which permits normal frontage uses up to quite high levels in the traffic hierarchy. A 'separate functions' model based on UK guidelines is advocated. Thus, frontages to roads serving any traffic distribution function should be minimised. (a) For the covering entry of this report see IRRD 868548.