An official website of the United States government
Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Sources: Seasonally Adjusted Transportation Data—U.S. Department of Transportation, Bureau of Transportation Statistics, available at www.bts.gov as of September 2015.