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Development of a comprehensive urban commodity/freight movement model for Texas.
  • Published Date:
  • Language:
Filetype[PDF-4.52 MB]

  • Alternative Title:
    Project title: Comprehensive commodity/freight movement model for Texas
  • Publication/ Report Number:
  • Resource Type:
  • Geographical Coverage:
  • OCLC Number:
  • Edition:
    Technical report; Sept. 2002-Aug. 2005.
  • NTL Classification:
    NTL-FREIGHT-FREIGHT ; NTL-FREIGHT-Freight Planning and Policy ; NTL-PLANNING AND POLICY-Freight Planning and Policy ;
  • Abstract:
    The Texas Department of Transportation (TxDOT) developed the Texas Statewide Analysis Model (SAM) to provide analysis and

    forecasting capabilities of passenger and commodity/freight movements in Texas. The SAM provides data and results at a level

    that is more aggregate than that typically accomplished within urban areas in their travel demand models. Travel demand models

    for 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 not

    integrated the SAM and urban travel demand models.

    The purpose of this research was to provide a Texas analysis model that would disaggregate statewide estimates of

    commodities/freight within the Texas traditional urban travel demand model boundaries. The research has developed a

    disaggregation model for integrating the SAM commodity estimates into the urban framework and a “bottom-up” model for

    estimating the commodity movements internal to the urban area that occur in addition to statewide movements. The integration of

    the SAM estimates involves disaggregation of internal to internal, external to internal, and external to external movements. The

    SAM accomplishes disaggregation using existing demographic data at the urban level. The urban model component uses data

    from 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 of

    the state travel survey program. The urban model also specifically estimates vehicle (truck) movements that do not involve the

    transfer of commodities as well as movements of empty vehicles. Included in the research was the application of the urban model

    and integration of the SAM estimates for the Houston-Galveston Area to develop estimates of commodity movements in the

    Houston-Galveston Area and estimate the truck movements associated with those commodities.

    17. Key Words

    Freight, Commodity, Generation, Distribution, Assignment,

    Shipping Rates, Receiving Rates, Non-Transfer Vehicle

    Movements, Commercial Vehicle Survey, Workplace Survey,

    External Station Survey, Critical Link Analysis, TransCAD,

    TRIPCAL5, ATOM2, Statewide Analysis Model

    18. Distribution Statement

    Limited Distribution

    19. Security Classif.(of this report)

    Unclassified 20. Security Classif.(of this page)


    21. No.

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