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Abstract:One potential advancement of the four-step travel model process is the forecasting and simulation of individual activities and travel. A common concern with such an approach is that the data and computational requirements for a large-scale, regional microsimulation may be so intensive that a successful application would be virtually impossible for a typical Metropolitan Planning Organization (MPO) or other agency to achieve. The North Central Texas Council of Governments (NCTCOG) is the Metropolitan Planning Organization (MPO) for the 5,000-square-mile, four-million-person Dallas-Fort Worth Metropolitan Area. Since 1995, NCTCOG has had the opportunity to work with Los Alamos National Laboratory (LANL) on a case study application of the first interim operational capability of a 'next generation' travel simulation and forecasting tool known as the TRansportation ANalysis and SIMulation System (TRANSIMS). This paper presents an overview of NCTCOG's involvement in the Traffic Microsimulation Case Study, which represents the first interim operational capability of TRANSIMS. Issues surrounding the required detail and accuracy of network coding and travel data are discussed, both for existing (observable) and forecast conditions. The need for (and procedures for) calibration and validation on both a micro- and macro- level will be described. Database management techniques for keeping track of all information and the computational and manpower requirements for a successful application are discussed. 7p.
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