This chapter presents the structure of a system of traffic models that has been developed in Stockholm and describes some of the major results that have been obtained. The system will be used for policy analysis by different regional planning authorities in Stockholm County, where many important planning issues are currently being considered. The model system allows for linkages between different choice levels and takes into account a number of possible choices that have not normally been included in the model systems. It also takes into account different household interactions, for example, concerning the allocation of the car between household members and the selection of household members to do the shopping. The model system also incorporates the effect of various constraints. The system includes models for work, school, business, shopping, social visits, and other trip purposes. The models are based on a detailed home-interview survey and are estimated using maximum-likelihood methods. The models are being implemented in a forecasting program that runs on microcomputers to produce summary information and trip matrices for assignment. (A)
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