Bureau of Transportation StatisticsCreated "to administer data collection, analysis, and reporting and to ensure the most cost-effective use of transportation-monitoring resources. BTS brings a greater degree of coordination, comparability, and quality standards to transportation data, and facilitates in the closing of important data gaps." Click on the Data and Statistics link to find information by mode (aviation, rail, etc.) or by subject (safety, environment, etc.) Includes a directory of databases from various agencies.