Project title: Comprehensive commodity/freight movement model for Texas

671795940Technical report; Sept. 2002-Aug. 2005.PDFTech ReportFHWA/TX-06/0-4430-10-4430Freight and passenger trafficFreight trafficPassenger trafficCommodity flowShipmentsUrban goods movementTexasTexas Transportation InstitutePearson, David F.Roop, Stephen S.Warner, Jeffery E.Farnsworth, Stephen P.Vadali, SharadaVilla, Juan CarlosLee, SangkugTexas Transportation InstituteTexas. Dept. of TransportationUnited States. Federal Highway AdministrationNTL-FREIGHT-FREIGHTNTL-FREIGHT-Freight Planning and PolicyNTL-PLANNING AND POLICY-Freight Planning and PolicyBTS Data DirectoryThe Texas Department of Transportation (TxDOT) developed the Texas Statewide Analysis Model (SAM) to provide analysis andforecasting capabilities of passenger and commodity/freight movements in Texas. The SAM provides data and results at a levelthat is more aggregate than that typically accomplished within urban areas in their travel demand models. Travel demand modelsfor urban areas typically concentrate on person estimates and at an aggregate level also estimate commercial vehicle (i.e., truck)movements. To produce consistent compatible estimates of passenger and commodity/freight movements, agencies have notintegrated the SAM and urban travel demand models.The purpose of this research was to provide a Texas analysis model that would disaggregate statewide estimates ofcommodities/freight within the Texas traditional urban travel demand model boundaries. The research has developed adisaggregation model for integrating the SAM commodity estimates into the urban framework and a \ue2\u20ac\u153bottom-up\ue2\u20ac? model forestimating the commodity movements internal to the urban area that occur in addition to statewide movements. The integration ofthe SAM estimates involves disaggregation of internal to internal, external to internal, and external to external movements. TheSAM accomplishes disaggregation using existing demographic data at the urban level. The urban model component uses datafrom typical urban travel demand models, including software currently used by TxDOT in their urban travel demand models.Modeling data such as shipping/receiving rates, trip length, load factors, etc. were developed from travel surveys done as part ofthe state travel survey program. The urban model also specifically estimates vehicle (truck) movements that do not involve thetransfer of commodities as well as movements of empty vehicles. Included in the research was the application of the urban modeland integration of the SAM estimates for the Houston-Galveston Area to develop estimates of commodity movements in theHouston-Galveston Area and estimate the truck movements associated with those commodities.17. Key WordsFreight, Commodity, Generation, Distribution, Assignment,Shipping Rates, Receiving Rates, Non-Transfer VehicleMovements, Commercial Vehicle Survey, Workplace Survey,External Station Survey, Critical Link Analysis, TransCAD,TRIPCAL5, ATOM2, Statewide Analysis Model18. Distribution StatementLimited Distribution19. Security Classif.(of this report)Unclassified 20. Security Classif.(of this page)Unclassified21. No