49 C.F.R. § 325.21 Scope of the rules in this subpart.
Title 49 - Transportation
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.
Title 49: Transportation
PART 325—COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS
Subpart C—Instrumentation
§ 325.21 Scope of the rules in this subpart.
