ABSTRACT
The demand for transportation services is a derived demand based on the needs of people to perform daily and other episodic activities. There have been two dominant approaches to investigating this derived demand: (1) studies focused on the spatial behavior of people, that is, the recorded behavior of people as they move between origins and destinations (e.g., Hanson and Schwab, 1995); and (2) an examination of the decision making and choice processes that result in spatially manifest behaviors (e.g., Ben-Akiva and Lerman, 1985; Ortúzar and Willumsen, 1994). The former approach has been typified by the development of methods for describing and analyzing activity-travel patterns. The latter is typified both by structural models that involve modeling the final outcomes of decision processes, but paying little attention to the cognitive processes involved in determining the final decision concerning movement in space, and by behavioral process models paying particular attention to the cognitive factors involved in decision making, as well as to the final choice act (Golledge and Stimson, 1997).
