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This paper will attempt to contribute to GIS Transportation Data Modeling by considering transport demand related issues. A great deal of information related to UTPS models as well as any kind of submodels involved in managing transport demand (gravity models, logit models, residential models, multiple regression models etc.) could be exchanged with GIS transport-related applications. Identifying this kind of data exchange may lead to refining existing transportation data model design. In this respect, EMME/2, an interactive-graphic state-of-the-art multimodal urban transportation planning system used by numerous transportation authorities worldwide as well as by the Athens Metro Authority in Greece, has been employed as a reference example to provide valuable experience toward this direction.