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Letter Report to the Bureau of Transportation Statistics (2004) / Chapter Skim
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Contents of Letter Report
Pages 1-8

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From page 1...
... to transmit this letter report from the Committee on the Bureau of Transportation Statistics International Trade Traffic Study. Convened uncler provisions of Section 5~ ~5 of the Transportation Equity Act for the 2Ist Century (TEA-21)
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From page 2...
... , collectecl by the Census Bureau, given the central role that this survey plays in the development of core data inputs to the ton-miles estimates. The BTS stiffly concludes that CFS data, used to calculate the tonnage, value, organ and destinations, and distance traveled of export freight movement by truck, suffer significant shortcomings for this nuroose.
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From page 3...
... quality to permit precise determination of international trade traffic by state. The committee's preliminary review of the availability of valiclate(1 data for the estimates suggests neetlecl improvements in data collection programs to enhance the accuracy and reliability of international tracle traffic measures for formula apportionment purposes.
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From page 4...
... in the current allocation formulae inclucle lane miles, vehicle miles traveled, diesel fuel usage, state population, urbanized area population, and nonhighway recreational fuel use. Each of these data elements has its own error measures, as well as an established validation procedure that is clocumentec!
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From page 5...
... The committee concurs with the BTS report that the process of disaggregating diesel fuel use into its domestic and international trade traffic components wouIc! compound variability in that it would apply a ratio of two estimates with significant variability with state diesel fuel use data that have known quality problems.
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From page 6...
... Data Sources Because there are no direct measures of ton-miles and value-miles of international trade traffic carried by highways for each state, data from a variety of sources, none of which was specifically developed for this purpose, have to be used in the estimates. Previous National Research Council studies have assessed several ofthese data sources.2 ~ its final report, the committee will address the strengths and weaknesses ot each ot~these data sources in some detail.
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From page 7...
... many of the difficulties that wouic! be encountered in developing measures of ton-miles and value-miles of international tracle traffic carried on highways in each state, and it directed the BTS to identify long-term clata improvements to provide accurate and reliable measures for use in highway apportionments.
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From page 8...
... Joe] Horowitz, Chair Committee on the Bureau of Transportation Statistics International Tracle Traffic Stucly Attachments 4 M.J.
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Key Terms

  • trade traffic
  • diesel fuel
  • international tracle
  • bts report
  • tracle traffic

  • transportation statistics
  • traffic carried
  • flow survey
  • highway apportionments
  • bts study

  • commodity flow
  • fecleral highway
  • data quality
  • miles traveled
  • data elements

  • traffic data
  • allocation formula
  • fuel data
  • committee concurs
  • formula allocation

  • traffic study
  • disaggregating diesel
  • census bureau
  • trade data
  • report assesses

  • report appropriately
  • traffic measures
  • cfs data
  • statistics international
  • formula factors


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