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.