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microsimulation techniques could be employed. The paper describes the steps that DTA models employ, some difficulties encountered with a large- scale implementa- tion of a DTA model using Vista, and the findings of detailed analysis of these problems. The intent is not to showcase any particular DTA package but to identify problems that are likely to be encountered in any DTA implementation and to under- stand why they occur. The problems addressed include excessive localized congestion, excessive variability in movement travel times by exiting vehicles, and why vehi- cles continue to be routed through problem areas even after congestion has developed. The work on which this paper is based is ongoing. It is hoped that additional insight, clarification, and con- clusions will be forthcoming and that there will be an opportunity to discuss them and hear of other experi- ences at the Innovations in Travel Modeling Conference. REFERENCE Daganzo, C. F. The Cell Transmission Model: A Simple Dynamic Representation of Highway Traffic Consistent with the Hydrodynamic Theory. Transportation Research Part B: Methodological, Vol. 28, No. 4, 1994, pp. 269â287. 108 INNOVATIONS IN TRAVEL DEMAND MODELING, VOLUME 2