Research was conducted in Chicago on identifying factors underlying chose of travel mode, determining the relationship of these factors, and developing a method of analysis and forecasting. A bibliography of published material relating to modal assignment in urban transportation is included. This covers mathematical models for modal assignment, analyses of data on factors influencing modal chose, and selected collateral and background material. A survey is presented of existing models and procedures for "modal split" in urban travel. The sources of the models, the methods used, and the factors explicitly incorporated are covered. In model formulation in the present project emphasis is placed on treating the complex of travel facilities and the population of trip makers within a comprehensive and unified framework. This leads to the concept of a multimode network in which the links can be of any modes and mixed-mode trips are accorded the same status as pure-mode trips.
Abstract