Alternative travel behaviour structures. Structure of passenger travel demand models. Presented at the 53rd Annual Meeting of the Highway Research Board, Washington, January 1974.

This study is concerned with the structure of travel demand models. Two alternative structures are defined, simultaneous and recursive, that are based on different hypotheses about the underlying travel decision-making process. Theoretical reasoning indicates that the simultaneous structure is more sensible. The results of the recursive models showed that estimated model coefficients vary considerably with different model structures. The simultaneous model structure is recommended.