Author(s)

A.D. May & S.R Shepherd

Abstract

Area speed-flow relationships and network aggregation A.D. May, S.R Shepherd Institute for Transport Studies, The University of Leeds, UK I. Introduction This paper summarises work carried out on an EPSRC funded project with the following objectives :- 1. to investigate the interaction between vehicle-kilometres and vehicle- hours in a network as individual junctions become saturated; 2. to develop improved area speed-flow relationships which reflect the relationships in (1); 3. to use the relationships in (1) and (2) to explain the process by which networks reach capacity; 4. to assess the significance, for the evaluation of road pricing policies, of the use of the improved relationship in (2). The relationship between speed and flow is fundamental to the understanding of congestion, and of the increased delay which is generated as flow increases. It is also the major determinant of demand for road use in congested areas since,

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