PART 325--COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS

Sections Interpreted

§325.1 Scope Of The Rules In This Part

Question 1: What noise emission requirements are applicable to auxiliary generators?

Guidance: Auxiliary generators which normally operate only when a CMV is stopped or moving at 5 mph or less are "auxiliary equipment" of the kind contemplated by EPA and are, therefore, exempt from the noise limits in Part 325. However, noise from generators that run while the CMV is moving at higher speeds would be measured as part of total vehicle noise.

Question 2: Do refrigeration units on tractor-trailer combinations fall within the exemption listed in part 325, subpart A of the FMCSRs?

Guidance: No.