Travel Demand Model - OKI

OKI/MVRPC Travel Demand Model – Version 6.03.2 Truck Trip End SummariesTable 3.4, below shows the base-year generation of FAZ SU and MU truck trip ends for the seed matrixand the final adjust trip tables. In addition, the table includes total base-year employment and householdtotals and identifies the FAZ place names for some of the larger generators of truck trips. In general, thistable shows that FAZs with larger employment totals and households will generate more trips, with anumber of significant truck trip generators throughout the region. Zones with large concentrations ofretail and service employment, such those representing the Cincinnati and Dayton CBDs, generate largenumbers of SU truck trips. In contrast, zones with major trucking facilities, such as Sharonville, or a highconcentration of manufacturing employment, such as Moraine, generate large numbers of MU truck trips.Differences between the trip ends initial estimated in forming the seed matrix and the trip ends ultimatelyproduced through SME calibration are apparent for some FAZs. In aggregate, the number of base-yeartrip ends for SU truck trip ends is more than halved, while the number of MU trip ends is reduced byabout eight percent. A local commercial vehicle survey would be needed to determine the meaning ofthese differences. The SME tables have the advantage of having been calibrated to produce O-D flowsthat provide a better fit to the observed count data and are thus more likely reflect local trip patterns.Also, the trip rates use to produce seed matrix productions and attractions are average rates that werederived in another region of the country and may not accurately reflect the truck trip generatingcharacteristics of a particular zone in the Cincinnati-Dayton region.Table 3.5, below, shows the SU and MU truck trip ends at external stations, as derived from theexpanded ODOT external station survey. Stations are identified by their FAZ and Consolidated TAZnumbers, and some of the larger-truck volume facilities are labeled with route designations. These tripends were formed, following the ODOT technical memorandum for survey expansion, as described inSection 2.2 of this document. They were not changed by the SME procedure; however, the use of thebucket rounding procedure to convert floating point trip tables to truck tables with integer values,resulted in some stations gaining or losing a small portion of daily truck trips.Truck Model - Base-Year Truck Model Results 32