Authors: William R. Black
Addresses: Department of Geography, Indiana University, Bloomington, Indiana 47405, USA
Abstract: The traditional approach to urban transportation planning involves trip generation, distribution, modal split and assignment. For the most part these steps are logical and have a reasonable foundation in reality. The weakest of these on logical grounds is the distribution of trips using the gravity model. This approach gained acceptance in large part because total trips in an urban area tend to decrease with increasing distance. It is argued here that this is an artefact of the geographical distribution of trip productions and attractions. If this is true it has significant implications for sustainable transport, lands use planning and congestion management, i.e., we may be controlling the wrong variables. A new approach to trip distribution is proposed that assigns trips on the basis of opportunity sets (possible destinations) and trip purpose ranges (the maximum distance one is willing to or must travel for a given purpose).
Keywords: trip distribution; sustainable transport; gravity models; land use modelling; congestion management; trip length; urban transportation planning; urban trips; sustainability; sustainable development.
International Journal of Environment and Sustainable Development, 2009 Vol.8 No.3/4, pp.215 - 228
Available online: 13 Apr 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article