Area Speed Flow Relationships by Micro- Simulation: Grid Networks

Abstract

This working paper is the second in a series relating to the EPSRC funded project, " The Definition of Capacity in Urban Road Networks : The Role of Area Speed-Flow Relationships". The paper reports on the collection of the four measures described by May and Shepherd (1994) for a 6x6 grid network for various origin destination patterns. The grid is divided into zones. Within each zone the simulated links are defined as either inbound, outbound or orbital in nature and the data is aggregated according to link type and vehicle generation time or period. This form of data aggregation is required by the strategic model START. The aim of this paper is to determine the area speed flow relationships within the zone links and to test whether they are sensitive to changes in OD pattern. Six different OD patterns have been simulated across a similar range of demand