{"data":{"id":"us/49-cfr-397.203","jurisdiction":"us","citation":"49 CFR 397.203","heading":"Standards for determining preemption.","body":"(a) Any highway routing designation established, maintained, or enforced by a State, political subdivision thereof, or Indian tribe is preempted if—\n(1) Compliance with both the highway routing designation and any requirement under the Act or of a regulation issued under the Act is not possible;\n(2) The highway routing designation as applied or enforced creates an obstacle to the accomplishment and execution of the Act or the regulations issued under the Act; or\n(3) The highway routing designation is preempted pursuant to § 397.69(b) of this part.\n(b) [Reserved]","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS","PART 397—TRANSPORTATION OF HAZARDOUS MATERIALS; DRIVING AND PARKING RULES","Subpart E—Preemption Procedures"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"aee68b04aff7866e67d358896a47df3e887e821832aeeb8e1fd1cd9b6e18b780","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-397.201","next":"us/49-cfr-397.205"},"notice":"GroundRules: Original legal text. Not legal advice."}