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.
The Trail Routing, Analysis, and Information Linkage System (TRAILS) User Guide provides detailed instructions for using the Trail Routing, Analysis, and Information Linkage System (TRAILS) online application.
Public Domain.
