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BREAKOUT SESSION
Data and Synthetic Populations
Erik Sabina, Denver Regional Council of Governments
Gregory Erhardt, PB Consult, Inc.
Thomas Rossi, Cambridge Systematics, Inc.
John Coil, Denver Regional Council of Governments
John Bowman, John Bowman Research and Consulting
Guy Rousseau, Atlanta Regional Commission
Bin Zhou, University of Texas at Austin
Kara Kockelman, University of Texas at Austin
PROCESSING THE DENVER TRAVEL SURVEY TO and disaggregate land use model components. This phase
SUPPORT TOUR-BASED MODELING: METHODS, is currently under way. The tour-based model builds on
DATA, AND LESSONS LEARNED the previous work in San Francisco; Portland, Oregon;
New York; Columbus, Ohio; and Atlanta.
Erik Sabina, Gregory Erhardt, Thomas Rossi, · The Travel Behavior Inventory (TBI) was con-
and John Coil ducted before the start of the refresh phase. The TBI
involved a suite of regional surveys, including a house-
hold travel survey. Data collection in 1997 included a
Greg Erhardt described the travel surveys conducted by home interview survey, an onboard transit survey, a com-
the Denver Regional Council of Governments (DRCOG) mercial vehicle survey, and an external station survey.
as part of the development of a new activity-based travel · The initial home interview survey design used an
model. He discussed the background to the surveys, the activity-based format with one record of data collected
survey methods, and the results. Volume 2 includes a for each activity engaged in by household members. The
paper on the topic.1 The following points were high- results from the pilot survey indicated that individuals
lighted in his presentation. found this format confusing. As a result, a place format
survey was used, following the approach used in New
· The development of the DRCOG integrated York. Respondents were asked to describe the sequences
regional model includes three phases. The refresh phase of places they visited throughout the day and what they
included a partial reestimation and a full recalibration of did there. Respondents were asked to select primary and
the existing trip-based model. This phase has been com- secondary activities from a list of 12 possibilities. A sam-
pleted. The vision phase, which included the evaluation ple of 4,196 households completed the survey. An addi-
of advanced modeling techniques and projects through- tional 677 households, recruited through an onboard
out the United States and Europe, is also complete. The transit survey, also completed the place format survey.
update phase entails the development of an integrated The onboard transit survey collected basic information
modeling system, including a tour-based travel model on trip purpose and demographic characteristics of the
rider. Passengers on 51 routes were included in the sur-
1 See Sabina, E. E., G. D. Erhardt, T. F. Rossi, and J. Coil. Processing vey, which was also used to recruit the transit riders for
the Denver Travel Survey to Support Tour-Based Modeling: Methods,
the place format survey.
Data, and Lessons Learned. In Conference Proceedings 42:
Innovations in Travel Demand Modeling, Volume 2: Papers, · Three traditional trip purposes were included in
Transportation Research Board of the National Academies, the survey. These trip purposes were home-based work
Washington, D.C., 2008, pp. 4953. (HBW), home-based nonwork (HBNW), and non-home-
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