Standard for retarders.

Effective January 15, 1984, no carrier subject to this regulation shall operate retarders that exceed an adjusted average maximum A-weighted sound level of 83 dB at any receiving property measurement location, when measured with fast meter response in accordance with Subpart C of this part. [45 FR 1263, Jan. 4, 1980; 47 FR 14709, Apr. 6, 1982]