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108 I N N O VAT I O N S I N T R AV E L D E M A N D M O D E L I N G , V O L U M E 2 microsimulation techniques could be employed. The The work on which this paper is based is ongoing. It paper describes the steps that DTA models employ, some is hoped that additional insight, clarification, and con- difficulties encountered with a large-scale implementa- clusions will be forthcoming and that there will be an tion of a DTA model using Vista, and the findings of opportunity to discuss them and hear of other experi- detailed analysis of these problems. ences at the Innovations in Travel Modeling Conference. 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- REFERENCE stand why they occur. The problems addressed include excessive localized congestion, excessive variability in Daganzo, C. F. The Cell Transmission Model: A Simple Dynamic movement travel times by exiting vehicles, and why vehi- Representation of Highway Traffic Consistent with the cles continue to be routed through problem areas even Hydrodynamic Theory. Transportation Research Part B: after congestion has developed. Methodological, Vol. 28, No. 4, 1994, pp. 269287.