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Preface O n May 2123, 2006, the Transportation Research CONFERENCE PLANNING Board (TRB) convened the Innovations in Travel Demand Modeling Conference in Austin, Texas. To plan this conference, TRB assembled the Committee The conference was sponsored by the following agencies, on Innovations in Travel Demand Modeling: A Confer- organizations, and companies to provide an opportunity ence, appointed by the National Research Council. for a frank exchange of ideas and experiences among aca- Under the chairmanship of Chandra R. Bhat, University demics, model developers, and practitioners: TRB, the Fed- of Texas at Austin, and Kenneth J. Cervenka, North Cen- eral Highway Administration (FHWA), the Federal Transit tral Texas Council of Governments, the planning com- Administration (FTA), the Central Texas Regional Mobil- mittee identified three objectives for the conference. The ity Authority, the Capital Metropolitan Transportation first objective was to examine advances in travel demand Authority, PBS&JAustin, URS Corporation, and HNTB modeling. The second objective was to facilitate the shar- Corporation. Approximately 220 individuals participated, ing of ideas and information among academics and prac- including individuals from across the transportation titioners on the opportunities and the challenges research community--at national, state, regional, and local associated with the implementation of advanced travel levels and from the public and private sectors and models. The third objective was to identify additional academia. areas for research, education, and training to ensure that the travel demand modelers of today and tomorrow are adequately prepared to apply the new model techniques. BACKGROUND After identifying the three main objectives listed above, the committee issued a call for papers. The com- The last major specialty travel demand modeling con- mittee sought high-quality three- to five-page white ference was held as part of the U.S. Department of papers addressing the themes of the interactive sessions. Transportation's Travel Model Improvement Program The themes included the following: (TMIP) in the fall of 1996. At that time, there was little research and no practical application of land use models Data needs to support activity-based and land use and activity-based travel demand models, or integration microsimulation models; of these models with demographic, economic, and net- Innovations in survey data collection to support work modes. Since then, there has been a literal revolu- travel demand forecasting; tion in travel demand forecasting. In particular, Population and household synthesis; significant advances have been realized over the past Validation and assessment of activity-based travel decade in survey methods and analysis tools available to models; the travel demand modeling profession. Implementation of activity-based models; v