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Preface O n May 21 through 23, 2006, the Transportation appointed by the National Research Council. Under the Reseach Board (TRB) convened the Innovations chairmanship of Chandra R. Bhat, University of Texas at in Travel Demand Modeling Conference in Austin, and Ken Cervenka, North Central Texas Council Austin, Texas. The conference was sponsored by the fol- of Governments, the planning committee identified three lowing agencies, organizations, and companies to pro- objectives for the conference. The first was to examine vide an opportunity for a frank exchange of ideas and advances in travel demand modeling. The second was to experiences among academics, model developers, and facilitate the sharing of ideas and information among aca- practitioners: TRB, FHWA, FTA, the Central Texas demics and practitioners on the opportunities and the chal- Regional Mobility Authority, the Capital Metropolitan lenges associated with the implementation of advanced Transportation Authority, PBS&JAustin, URS Corpo- travel models. The third was to identify additional needs ration, and HNTB Corporation. for research, education, and training to ensure that the Approximately 220 individuals from across the travel demand modelers of today and tomorrow are ade- transportation research community--at national, state, quately prepared to apply the new model techniques. regional, and local levels and from the public and pri- After identifying the three main objectives and, hence, vate sectors and academia--participated. topic areas, the committee issued a call for papers, seeking high-quality white papers of three to five pages addressing the themes of the interactive sessions. The themes included BACKGROUND Data needs to support activity-based and land use The last major conference on specialty travel demand microsimulation models; modeling was held as part of the U.S. Department of Innovations in survey data collection to support Transportation's Travel Model Improvement Program travel demand forecasting; (TMIP) in the fall of 1996. At that time, there was little Population and household synthesis; research and no practical application of land use models Validation and assessment of activity-based travel and activity-based travel demand models and their inte- models; gration with demographic, economic, and network Implementation of activity-based models; modes. Since then, there has been a literal revolution in Emerging traffic microsimulation applications; travel demand forecasting. In particular, significant Innovations in traffic assignment and improve- advances have been realized over the past decade in sur- ments of forecast speeds; vey methods and analysis tools available to the travel Institutional, monetary, staff, data, hardware, and demand modeling profession. training resources needed to move innovative approaches to practice; and The role of models in decision making in the con- CONFERENCE PLANNING temporary decision-making context. To plan this conference, TRB assembled the Committee for The final versions of these papers are reproduced in Innovations in Travel Demand Modeling: A Conference, Volume 2. v