---
kind: "section"
citation: "23 C.F.R. § 650.503"
title: "23"
number: "650.503"
heading: "Applicability."
url: "https://uscodex.org/cfr/23/650.503"
---

# §650.503. Applicability.


The National Tunnel Inspection Standards (NTIS) in this subpart apply to all structures defined as highway tunnels on all public roads, on and off Federal-aid highways, including tribally and federally owned tunnels.


## Notes

### Source

Source: 80 FR 41368, July 14, 2015, unless otherwise noted.

### Authority

Authority: 23 U.S.C. 119, 144, and 315.