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This paper is a report on the development of a new method for congestion management, access control, and impact simulation. It targets impact assessment of developments when they are combined with large activity centers. The magnitude of impacts necessitate assessment of the regional and local effects of the developments. The new method combines regional and local traffic models and it used Geographic Information Systems (GIS) as a support tool. The research here attempts to create better quantitative models for congestion management and access control by considering local and regional traffic impacts together. GIS technology enables users to create detailed highway networks that can be used in regional forecasting models and in smaller traffic simulation models. Data from a variety of sources are used to represent the highway network, estimate models of human behavior, and to depict intersection …