This theoretical analysis is the first part of a four-part study in preparation of research into the relationship between driving speeds and road safety. Central to the analysis of the driving speed problem is the balancing of both mobility and accessibility against safety purposes. The speed problem can be specified to a degree in terms of similarities and differences between collective government and individual road user decision processes. The problem may be further specified in terms of balancing unity against differentiation of speed limits. They should be considered in relation to :(1) physical conditions; (2) road categories; (3) situational differences within road categories; and (4) in relation to various vehicle categories within the same situations. Ultimately, a speed limit system should be considered in relation to: (i) the organization and structure of the road network as a whole; and (ii) in relation to the supply of mobility that is generated. Immediate relations between speed limits or levels and safety are to be found where they determine the input conditions for the performance of manoeuvres or the negotiation of conflicts. The speed safety problem is differently defined for a number of specified road categories. See also IRRD 868892-868894 (C 3154-3155).
Abstract