Download NTI Data
The following datasets represent tunnel data submitted annually to FHWA by the States, Federal agencies, and Tribal governments in accordance with the National Tunnel Inspection Standards and the Specifications for the National Tunnel Inventory. Each dataset is submitted in the spring, and may be corrected or updated throughout the year. The data for all public highway tunnels are considered final and are published on this website at the end of each calendar year.
- Specifications for the National Tunnel Inventory (SNTI) (June, 2015)