49 CFR 325.21 - Scope of the rules in this subpart.

Regulations last checked for updates: Feb 11, 2026

Title 49 - Transportation last revised: Feb 03, 2026

View all text of Subpart C [§ 325.21 - § 325.27]

§ 325.21 - Scope of the rules in this subpart.

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.

authority: 42 U.S.C. 4917; 49 U.S.C. 301; and 49 CFR 1.87

source: 40 FR 42437, Sept. 12, 1975, unless otherwise noted.

cite as: 49 CFR 325.21