§ 325.31 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.
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.