Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

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.

Significant Guidance

This page shows Department of Transportation content pertaining to a specific tag. If you cannot find what you’re looking for on this page, please use the search box in the top right of our website.

Lists of Significant DOT Guidance Documents

Information about and links to each DOT operating administration and OST Web site where the agency provides a list with information about all of its significant guidance documents that are currently in effect.