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Innovations in Travel Demand Modeling, Volume 2: Papers (2008)

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Suggested Citation:"T57054 txt_051.pdf." National Academies of Sciences, Engineering, and Medicine. 2008. Innovations in Travel Demand Modeling, Volume 2: Papers. Washington, DC: The National Academies Press. doi: 10.17226/13678.
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DATA AND RESULTS The data from this survey first were used in a trip- based format for the refresh phase and will again be used in a tour- based format for the update phase. Of particular interest to practitioners deliberating a switch from a trip- based to a tour- based model is how the same data com- pare when coded in the two formats. A selection of such comparisons is included here. Table 1 shows basic statis- tics associated with the trip records, and Table 2 shows those same statistics associated with the tour records. Table 3 compares the trip purpose to the primary pur- pose of the tour for each trip record. As discussed later, these data can provide important insights into the areas of travel behavior when a trip- based model and a tour- based model might provide differing results. As Table 1 shows, only 17% of trips are HBW trips, while in Table 2, 33% of tours are work tours. This dis- crepancy suggests that work remains an important driver of travel, even though the number of HBW trips is rela- tively small due to trip chaining. This observation is sup- ported by Table 3, which shows that only half of all trips on work tours would be coded with an HBW purpose while the other half would be HBNW or NHB trips. School tours account for another 16% of all tours, and when viewed together, these two mandatory activities are central to almost half of all tours. Useful information comes from examining the distri- bution of NHB trips across various tour purposes, as shown in Table 3. NHB trips account for between 15% and 39% of the trips in each tour purpose. Having a meaningful purpose associated with these NHB trips is 51PROCESSING THE DENVER TRAVEL SURVEY For destination n in tour m Place Activity Time 1st: Out of model area? Then primary for m 2nd: Primary workplace? Then primary for m 3rd: Other type of place? 1st: Work? Then primary for m 2nd: School? Then primary for m 3rd: Other activity? Longest duration? Primary for m FIGURE 2 Primary destination decision tree. TABLE 1 Basic Trip Statistics Expanded % % with % Trip Purpose Trips Expanded Trips Trips/Person Trips/Household 3+ Trips % Shared Ride Transit HBW 1,505,685 17 0.8 1.7 26 9.1 5.1 HBNW 4,444,067 51 2.2 5.1 43 53.6 1.5 NHB 2,788,283 32 1.4 3.2 88 42.2 1.3 Total 8,738,035 100 4.4 10.1 55 42.3 2.1 HBW = home-based work; HBNW = home-based nonwork; NHB = non-home-based. TABLE 2 Basic Tour Statistics Expanded % % with % Trip Purpose Tours Expanded Tours Tours/Person Tours/Household 3+ Trips % Shared Ride Transit Work 1,060,271 33 0.5 1.2 44 8.1 5.3 School 514,967 16 0.3 0.6 29 44.9 4.7 Shopping 386,200 12 0.2 0.4 49 42.7 0.9 Social–recreational 291,877 9 0.1 0.3 39 58.5 3.1 Drop off and pick up 268,781 8 0.1 0.3 19 32.2 0.0 Other 701,429 22 0.4 0.8 36 50.5 1.5 Total 3,223,525 100 1.6 3.7 38 33.9 3.2

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TRB Conference Proceedings 42, Innovations in Travel Demand Modeling, Volume 2: Papers includes the papers that were presented at a May 21-23, 2006, conference that examined advances in travel demand modeling, explored the opportunities and the challenges associated with the implementation of advanced travel models, and reviewed the skills and training necessary to apply new modeling techniques. TRB Conference Proceedings 42, Innovations in Travel Demand Modeling, Volume 1: Session Summaries is available online.

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