National Tunnel Inspection Standards
Regulation
Policy
- NTIP Compliance Review Manual (.pdf) (03/01/2019)
- Specifications for the National Tunnel Inventory (.pdf) (June, 2015)
- NTI XML Schema
- Example XML (.xml)
- Tunnel Operations, Maintenance, Inspection, and Evaluation (TOMIE) Manual (.pdf) (July, 2015)
Guidance
- Inspection of Non-Structural Tunnel Elements Located above Roadways (.pdf) (11/06/2020)
- Use and Inspection of Adhesive Anchors in Federal-Aid Projects (T 5140.34) (.pdf) (01/16/2018)
- Inspection of Bridges and Tunnels on Transit Highway (08/23/2016)
- Inspection of Overhead Stainless Steel Structural Elements in Tunnels (02/04/2016)
- Guidance on Structures Subject to the National Tunnel Inspection Standards (NTIS) (.pdf) (10/27/15)