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 reviews quality issues on a regular basis and adjusts its programs and processes to ensure continuous quality improvement.

Data Sources

The data used throughout this document reflect the latest numbers available at the time of pub- lication. Data and statistics compiled in this report were obtained from a wide range of U.S. Department of Transportation operating administrations and other statistical agencies throughout the Federal Government.

Notice

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.