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P R O C E S S I N G T H E D E N V E R T R AV E L S U RV E Y 51 For destination n in tour m 1st: Out of model area? 2nd: Primary workplace? 3rd: Other type of Place Then primary for m Then primary for m place? Activity 1st: Work? 2nd: School? 3rd: Other Then primary for m Then primary for m activity? Longest duration? Time Primary for m FIGURE 2 Primary destination decision tree. As Table 1 shows, only 17% of trips are HBW trips, DATA AND RESULTS while in Table 2, 33% of tours are work tours. This dis- crepancy suggests that work remains an important driver The data from this survey first were used in a trip-based of travel, even though the number of HBW trips is rela- format for the refresh phase and will again be used in a tively small due to trip chaining. This observation is sup- tour-based format for the update phase. Of particular ported by Table 3, which shows that only half of all trips interest to practitioners deliberating a switch from a trip- on work tours would be coded with an HBW purpose based to a tour-based model is how the same data com- while the other half would be HBNW or NHB trips. pare when coded in the two formats. A selection of such School tours account for another 16% of all tours, and comparisons is included here. Table 1 shows basic statis- when viewed together, these two mandatory activities tics associated with the trip records, and Table 2 shows are central to almost half of all tours. those same statistics associated with the tour records. Useful information comes from examining the distri- Table 3 compares the trip purpose to the primary pur- bution of NHB trips across various tour purposes, as pose of the tour for each trip record. As discussed later, shown in Table 3. NHB trips account for between 15% these data can provide important insights into the areas and 39% of the trips in each tour purpose. Having a of travel behavior when a trip-based model and a tour- meaningful purpose associated with these NHB trips is based model might provide differing results. 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 Socialrecreational 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