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Quality Assurance Statement

The Bureau of Transportation Statistics (BTS) provides high quality information to serve government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. BTS periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.


This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for its contents or use thereof.

Unless otherwise stated, all material herein is from earlier editions of the Transportation Statistics Annual Report or from National Transportation Statistics, an online compilation of tables that is updated quarterly. The reports and tables are available at www.bts.gov.

Updated: Saturday, May 20, 2017