Code of Federal Regulations (Last Updated: July 5, 2024) |
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 |
§ 325.7 - Allowable noise levels.
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§ 325.7 Allowable noise levels.
Motor vehicle noise emissions, when measured according to the rules of this part, shall not exceed the values specified in Table 1.
Table 1 - Maximum Permissible Sound Level Readings (Decibel (A))1 2
Highway operation test Stationary tests Soft site Hard Site Soft site Hard site 35 mi/h or less Above 35 mi/h 35 mi/h or less Above 35 mi/h If the distance between the microphone location point and the microphone target point is - 31 ft (9.5m) or more but less than 35 ft (10.7m) 87 91 89 93 89 91 35 ft (10.7m) or more but less than 39 ft (11.9m) 86 90 88 92 88 90 39 ft (11.9m) or more but less than 43 ft (13.1m) 85 89 87 91 87 89 43 ft (13.1m) or more but less than 48 ft (14.6m) 84 88 86 90 86 88 48 ft (14.6m) or more but less than 58 ft (17.1m) 83 87 85 89 85 87 58 ft (17.1m) or more but less than 70 ft (21.3m) 82 86 84 88 84 86 70 ft (21.3m) or more but less than 83 ft (25.3m) 81 85 83 87 83 85 [40 FR 42437, Sept. 12, 1975, as amended at 54 FR 50385, Dec. 6, 1989]