{"data":{"id":"us/49-cfr-325.7","jurisdiction":"us","citation":"49 CFR 325.7","heading":"Allowable noise levels.","body":"Motor vehicle noise emissions, when measured according to the rules of this part, shall not exceed the values specified in Table 1.\nTable 1—Maximum Permissible Sound Level Readings (Decibel (A)) 1 2\nHighway operation test Stationary tests\nSoft site Hard Site Soft site Hard site\n35 mi/h or less Above 35 mi/h 35 mi/h or less Above 35 mi/h\nIf the distance between the microphone location point and the microphone target point is—\n31 ft (9.5m) or more but less than 35 ft (10.7m) 87 91 89 93 89 91\n35 ft (10.7m) or more but less than 39 ft (11.9m) 86 90 88 92 88 90\n39 ft (11.9m) or more but less than 43 ft (13.1m) 85 89 87 91 87 89\n43 ft (13.1m) or more but less than 48 ft (14.6m) 84 88 86 90 86 88\n48 ft (14.6m) or more but less than 58 ft (17.1m) 83 87 85 89 85 87\n58 ft (17.1m) or more but less than 70 ft (21.3m) 82 86 84 88 84 86\n70 ft (21.3m) or more but less than 83 ft (25.3m) 81 85 83 87 83 85\n1 The speeds shown refer to measurements taken at sites having speed limits as indicated. These speed limits do not necessarily have to be posted.\n2 This table is based on motor carrier noise emission requirements specified in 40 CFR 202.20 and 40 CFR 202.21.","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 A—General Provisions"],"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":"dfb2c80df3391118419482754969c0b8da2bb42e35d2196e6b9cce354853162a","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-325.5","next":"us/49-cfr-325.9"},"notice":"GroundRules: Original legal text. Not legal advice."}