developed by the Bureau in consultation with the Committee on National Statistics of the National Academy of Sciences.

Report—Not later than three years after the date of enactment of this Act, the Director shall submit to the Committee on Environment and Public Works of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives a report on the results of the study carried out under paragraph (1) including recommendations for changes in law necessary to implement the identified needs for improvements in long-term data collection programs.

Under these provisions of Section 5115, the BTS requested the Committee on National Statistics to convene a panel to evaluate the accuracy and reliability of measures of ton-miles and value-miles of international trade traffic carried by highway for each state for use as formula factors for highway apportionments. The specific goals of the study were to review the findings and recommendations of a BTS staff report (Bureau of Transportation Statistics, 2003) prepared in response to Section 5115 and to explore additional data sources and methods for providing improved estimates for use in apportionment formulas.

Since its formation in August 2003, the panel has held two open meetings and two meetings in executive session and commissioned two independent studies. At an initial fact-finding meeting in September 2003, the panel heard presentations from BTS staff and experts who had contributed to the development of BTS’s 5115 report (see the agenda, Appendix A). Subsequently, the panel held a workshop in November 2003, at which outside experts and government officials discussed specific aspects of the report (see the agenda, Appendix B). In total, 15 presentations were provided to the panel in open session. The experts provided advice on the validity and quality of data used in developing the report, on alternative and emerging means of developing data on international trade traffic, and on matters of access to public and proprietary data sources (see list of presenters and their topics, Appendix C).

The Panel on BTS International Trade Traffic Study submitted a letter report to BTS in February 2004 that addressed the various conclusions of the BTS report, and several key aspects of the findings (National Research Council, 2004). The letter report assessed the validity of the findings and recommendations in the report prepared in response to Section 5115 of



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