Travel Demand Model - OKI

OKI/MVRPC Travel Demand Model – Version 6.0Table 2-5. Daily Truck Trip Generation Rates (origins or destinations per unit)Employment CategorySingle-UnitTrucksMulti-UnitTrucksAgriculture, Mining and Construction (SIC 1-19) 0.289 0.174Manufacturing, Transportation, Communications, Utilities andWholesale Trade (SIC 20-51)0.242 0.104Retail Trade (SIC 52-59) 0.253 0.065Offices and Service (SIC 60-88) 0.068 0.009Households 0.099 0.038Source: Quick Response Freight Manual, USDOT, 1996, p. 4-4Correction factors were calculated differentially by SU and MU truck types, such that:SUCFMUCF= 0.952= 0.683Application of these correction factors effectively reduces the daily truck trip end generation rates torepresent the proportion of truck trip ends that are internal-internal. Conversely, these factors imply thatapproximately 5 percent of SU and 22 percent of MU truck productions and attractions have an externaltrip end (are IE/EI trips). Table 2-6, below, shows the adjusted rates.It is important to remember that the absolute numbers produced by the synthetic matrix estimationprocedure are factored to match actual traffic counts on the network, with the seed matrix values simplyserving as a starting point. Any remaining bias, upward or downward, would be mitigated to someextent by fitting the seed matrix flows to the link counts, provided the count data is robust.Table 2-6. Adjusted Daily Truck Trip Generation Rates (origins or destinations per unit)Employment CategorySingle-UnitTrucksMulti-Unit TrucksAgriculture, Mining and Construction (SIC 1-19) 0.275 0.119Manufacturing, Transportation, Communications, Utilities and WholesaleTrade (SIC 20-51)0.230 0.071Retail Trade (SIC 52-59) 0.241 0.044Offices and Service (SIC 60-88) 0.065 0.006Households 0.094 0.026Rates based on Quick Response Freight Manual, USDOT, 1996, p. 4-4, multiplied by factors of 0.952 for single-unit trucks and0.683 for multi-unit trucks.Truck Model - Base-Year Truck Model Development 15