ACTIVITY ANALYSIS AND TRAVEL DEMAND

Conventional transport demand models as well as disaggregate behavioural models of travel choice do not explicitly treat the demand for travel as a derived demand, although the derived nature of the travel decision has long been recognised in the transport literature. Activity-analysis brings into focus the various motivational factors and constraints, in addition to the travel characteristics, to illustrate a fact that travel decisions may be influenced by other general activity considerations. In particular, this paper will argue that the decisions on location, mode, route, time of day, as well as those on the type of travel (journey to work, shopping trip, leisure travel, etc.) are interrelated with other decisions on the allocation of limited individual resources among the various urban consumption activities (health, food, clothes, recreation, housing, as well as transport). The aim of the paper is to expose the inter-dependencies between these various activities in a simplified multi-stage decision model, so as to provide a starting point for future vigorous construction of a travel demand model based on activity-analysis. (A) /TRRL/