[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR325.1]

[Page 737-738]
 
                        TITLE 49--TRANSPORTATION
 
        CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION,
                      DEPARTMENT OF TRANSPORTATION
 
PART 325--COMPLIANCE WITH INTERSTATE MOTOR CARRIER NOISE EMISSION STANDARDS--Table of Contents
 
                      Subpart A--General Provisions
 
Sec. 325.1  Scope of the rules in this part.


    (a) The rules in this part prescribe procedures for inspection, 
surveillance, and measurement of motor vehicles and motor vehicle 
equipment operated by motor carriers to determine whether those vehicles 
and that equipment conform to the Interstate Motor Carrier Noise 
Emission Standards of the Environmental Protection Agency, 40 CFR part 
202.
    (b) Except as provided in paragraph (c) of this section, the rules 
in this part apply to motor carriers engaged in interstate commerce. The 
rules apply at any time or under any condition of highway grade, load, 
acceleration or deceleration.
    (c) The rules in this part do not apply to--
    (1) A motor vehicle that has a Gross Vehicle Weight Rating (GVWR) of 
10,000 pounds (4,536 kg.) or less;
    (2) A combination of motor vehicles that has a Gross Combination 
Weight Rating (GCWR) of 10,000 pounds (4,536 kg.) or less;
    (3) The sound generated by a warning device, such as a horn or 
siren, installed in a motor vehicle, unless such device is intentionally 
sounded in order to preclude an otherwise valid noise emission 
measurement;
    (4) An emergency motor vehicle, such as a fire engine, an ambulance, 
a police van, or a rescue van, when it is responding to an emergency 
call;
    (5) A snow plow in operation; or
    (6) The sound generated by auxiliary equipment which is normally 
operated only when the motor vehicle on which

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it is installed is stopped or is operating at a speed of 5 miles per 
hour (8 kph) or less, unless such device is intentionally operated at 
speeds greater than 5 mph (8 kph) in order to preclude an otherwise 
valid noise measurement. Examples of that type of auxiliary equipment 
include, but are not limited to, cranes, asphalt, spreaders, ditch 
diggers, liquid or slurry pumps, auxiliary air compressors, welders, and 
trash compactors.