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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Sep 16, 2025
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Title 49
Chapter III
Part 325
Subpart D - Subpart D—Measurement of Noise Emissions; Highway Operations
§ 325.31 - Scope of the rules in this subpart.
§ 325.33 - Site characteristics; highway operations.
§ 325.35 - Ambient conditions; highway operations.
§ 325.37 - Location and operation of sound level measurement system; highway operations.
§ 325.39 - Measurement procedure; highway operations.
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