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Allowable noise levels.
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Medical Form, 391.53, 391
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Part 325
< 325.5
325.9 >
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Subpart A - General Provisions
Code of Federal Regulations
§ 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
Soft site
35 mi/h or less
Above 35 mi/h
Hard Site
35 mi/h or less
Above 35 mi/h
Stationary tests
Soft site
Hard site
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
1
The speeds shown refer to measurements taken at sites having speed limits as indicated. These speed limits do not necessarily have to be posted.
2
This table is based on motor carrier noise emission requirements specified in 40 CFR 202.20 and 40 CFR 202.21.
[40 FR 42437, Sept. 12, 1975, as amended at 54 FR 50385, Dec. 6, 1989]
