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Rulebook › 49 CFR Part 325

§ 325.21 Scope of the rules in this subpart.

PART 325—COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS, last amended 2016-12-12

Official text from eCFR.gov, up to date as of 2026-10-22. Checked for changes every day.

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The rules in this subpart specify criteria for sound level measurement systems which are used to make the sound level measurements specified in subpart D and subpart E of this part.

Official text from the eCFR. The eCFR is an authoritative but unofficial editorial compilation; the Federal Register is the legal source.