{"data":{"id":"us/23-cfr-650.503","jurisdiction":"us","citation":"23 CFR 650.503","heading":"Applicability.","body":"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.","path":["Title 23—Highways","CHAPTER I—FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER G—ENGINEERING AND TRAFFIC OPERATIONS","PART 650—BRIDGES, STRUCTURES, AND HYDRAULICS","Subpart E—National Tunnel Inspection Standards"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-23.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:50Z","sha256":"ce84f186e702164f5bf0d092b38d827c50fe91713b9a01bf904b24adca2f2aa2","source_id":"us-cfr","stale":true,"prev":"us/23-cfr-650.501","next":"us/23-cfr-650.505"},"notice":"GroundRules: Original legal text. Not legal advice."}