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Scope of the rules in this subpart.
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Regulations current to Apr 12, 2013
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 All Regulations
Part 325
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Subpart D - Measurement of noise emissions; highway operations
Code of Federal Regulationsยง 325.31Scope of the rules in this subpart.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.
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