49 CFR Part 325

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Federal Motor Carrier Safety Regulations

49 CFR Part 325 - Compliance With Interstate Motor Carrier Noise Emission Standards

Data is current as of October 16, 2019

Contents:

Subpart A - General Provisions

§325.1 Scope of the rules in this part.

§325.3 Effective date.

§325.5 Definitions.

§325.7 Allowable noise levels.

§325.9 Measurement tolerances.

Subpart B - Administrative Provisions

§325.11 Issuance, amendment, and revocation of the rules in this part.

§325.13 Inspection and examination of motor vehicles.

Subpart C - Instrumentation

§325.21 Scope of the rules in this subpart.

§325.23 Type of measurement systems which may be used.

§325.25 Calibration of measurement systems.

§325.27 Use of a windscreen.

Subpart D - Measurement of Noise Emissions; Highway Operations

§325.31 Scope of the rules in this subpart.

§325.33 Site characteristics; highway operations.

§325.35 Ambient conditions; highway operations.

§325.37 Location and operation of sound level measurement system; highway operations.

§325.39 Measurement procedure; highway operations.

Subpart E - Measurement of Noise Emissions; Stationary Test

§325.51 Scope of the rules in this subpart.

§325.53 Site characteristics; stationary test.

§325.55 Ambient conditions; stationary test.

§325.57 Location and operation of sound level measurement systems; stationary test.

§325.59 Measurement procedure; stationary test.

Subpart F - Correction Factors

§325.71 Scope of the rules in this subpart.

§325.73 Microphone distance correction factors.

§325.75 Ground surface correction factors.

§325.77 Computation of open site requirements -- nonstandard sites.

§325.79 Application of correction factors.

Subpart G - Exhaust Systems and Tires

§325.91 Exhaust systems.

§325.93 Tires.