Travel Demand Model - OKI

OKI/MVRPC Travel Demand Model – Version 6.06. Trip Generation AnalysisAn initial trip generation analysis was performed prior to adjusting the production and attractionscale factors, that is, using the scale factors originally used by OKI and MVRPC. The results ofthis initial analysis are described in Section 6.1. Section 6.2 presents the final trip generationestimates, after the adjustment of the scale factors.6.1 Trip Generation Estimates, before Scale FactorsHome-based trip production and attraction estimates for the consolidated region, by purpose, arelisted in Table 6.1. This table lists trip totals including home-based trips produced and attractedat external zones (i.e., trip estimates before subtracting the internal-external trips). The tableallows direct comparisons of the home-based trip estimates without including the internalexternaltrip estimates.For the OKI region, the consolidated model estimates approximately the same number of tripproductions for all trip purposes as model v5.4. The small differences observed are due todifferences in the socioeconomic data, possibly introduced at the time when the original 1003zones were split into 1608 zones. For example, in the consolidated model the OKI regioncontains 895,322 employed residents while in version 5.4 of the OKI model the same region (i.e.not including Ohio Co.) contains 907,582 employed residents. This 1.4% reduction in thenumber of employed residents results, not surprisingly, in a 1.2% reduction in the number ofhome-based work trips.In terms of trip attractions, the OKI region gained home-based work trips, and lost home-basedother and home-based university trips. These changes are primarily due to the balancing of tripattractions to the total consolidated productions (by trip purpose). The implication for the modelis that some HBW trips produced in the Dayton region, and formerly attracted within the sameregion, are now attracted to the Cincinnati region. Conversely, for HBO trips, some trips formerlyproduced and attracted within the Cincinnati region are now attracted to the Dayton region.For the MVRPC region, the consolidated model estimates more home-based work trips and morehome-based other trips (substantially more in the case of Miami County) than their previousmodel. The consolidated model accounts for all non-transit home-based school trips as homebasedother trips; for this reason MVRPC and Miami County HBC trips have been included in theHBO column, with the exception of a small number of HBC transit trips which occur inMontgomery Co. As explained above, the MVRPC region lost HBW trip attractions, but gainedHBO attractions. Even though the consolidated model uses the MVRPC base classification tableand their own HBW and HBO trip production rates, there are still substantial differences in thetrip production estimates due to changes in the base socio-economic data. In particular, thedistribution and number of households used in MVRPC's Base 94 model was updated for use inthe consolidated model.The model estimates approximately 7.05 million home-based trip productions for the entireregion, which implies on average approximately 6.9 daily home-based trips per household.Trip Generation - Trip Generation Analysis 22