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Processing the Denver Travel Survey to Support Tour-Based Modeling Methods, Data, and Lessons Learned Erik E. Sabina, Denver Regional Council of Governments Gregory D. Erhardt, PB Consult Thomas F. Rossi, Cambridge Systematics, Inc. John Coil, Denver Regional Council of Governments T he Denver Regional Council of Governments were just beginning in practice in the nation's metropoli- (DRCOG) is completely restructuring its regional tan planning organizations. In the early phases of the TBI, model. This effort began with the conduct, in the DRCOG convened a panel of modeling practitioners to late 1990s, of the Travel Behavior Inventory (TBI) project, assess the current and possible near-future state of mod- a suite of regional surveys, including a household travel eling practice in the country so that travel surveys could survey. Following completion of the TBI, DRCOG began be designed to support those likely approaches. Data col- an Integrated Regional Model project, through which lected in 1997 included a home-interview survey, a brief DRCOG is rebuilding the regional model on the basis of onboard transit survey, a commercial vehicle survey, and TBI data, in three phases: an external station survey. The initial home-interview survey design was in an The refresh phase, a partial reestimation and full activity-based format; in this format, one record of data recalibration of DRCOG's existing trip-based model was collected for each activity in which the household (now complete); members engaged. While Metro in Portland, Oregon, The vision phase, an evaluation of advanced mod- concluded that its activity-based survey was only mar- eling techniques and projects throughout North America ginally more complex than a traditional trip-based sur- and Europe (also complete); and vey (1), respondents to the pilot survey in the Denver The update phase, a project to build an integrated region found the format confusing. These findings led to modeling system that includes components for both tour- development of a place format for the main survey that based travel models and disaggregate land use models was based on a similar survey conducted in New York. (under way). The place survey asked respondents to describe the sequence of places--including the address of each, the The paper is intended to aid modeling practitioners kind of place each was (from a list of categories), and who are considering implementing advanced techniques their activity at each--at which they stopped through the such as tour-based models by describing the type of sur- day. Respondents were asked to select primary and sec- vey DRCOG has used in its development of tour-based ondary activities at the place from a list of 12 possibili- models, the techniques and assumptions used to struc- ties (or to write in "other"). The survey included a ture the survey data for that use, and trip and tour sta- standard sample of 4,196 households as well as 677 tistics that the survey produced. households recruited through the onboard transit survey. Riders on 51 routes responded to the onboard transit survey, which collected basic information on the trip SURVEY DESCRIPTION purpose and demographic characteristics of the rider. The survey was used primarily to identify transit riders In the mid-1990s, when DRCOG began preparing for the who could be recruited to participate in the home- TBI project, attempts at advanced modeling approaches interview survey, and 677 households were recruited in 49