{"data":{"id":"us/49-cfr-325.31","jurisdiction":"us","citation":"49 CFR 325.31","heading":"Scope of the rules in this subpart.","body":"The rules in this subpart specify conditions and procedures for measurement of the sound level generated by a motor vehicle engaged in a highway operation for the purpose of ascertaining whether the motor vehicle conforms to the Standards for Highway Operations set forth in 40 CFR 202.20.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER A—GENERAL REGULATIONS","PART 325—COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS","Subpart D—Measurement of Noise Emissions; Highway Operations"],"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":"f3c98d5b530c53cd09ef94e3e727f387e3bc633907996ba62774ffd8741d0e38","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-325.27","next":"us/49-cfr-325.33"},"notice":"GroundRules: Original legal text. Not legal advice."}