SUBPART D—Measurement of Noise Emissions; Highway Operations (§325.31 to §325.39)
- 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.