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 public highway tunnels is considered final and is published on this website by June 15th of each calendar year.
- Specifications for the National Tunnel Inventory (SNTI) (June, 2015)
- NTI XML Schema
- Example XML (.xml)