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Vehicle Category <br /> Motorcycles manufactured after 1975 83 <br /> Any motor vehicle over 10,000 pounds <br /> GVWR or GCWR manufactured after 366 <br /> 1975 4B A) <br /> Any motor vehicle over 10,000 pounds <br /> GVWR or GCWR manufactured after <br /> 83 <br /> January 1, 1978 <br /> cl-B-(A) <br /> Any motor vehicle over 10,000 pounds <br /> GVWR or GCWR manufactured after 80 <br /> January 1, 1982 dB{-A} <br /> All other motor vehicles 80 <br /> ) <br /> Vehicle Category Date of Manufacture Maximum Sound <br /> Any motor vehicle over Before January 1, 1978 86 dBA <br /> 10,000 pounds GVWR <br /> excluding buses <br /> Any motor vehicle over After January 1, 1978 83 dBA <br /> 10,000 pounds GVWR <br /> excluding buses <br /> Any motor vehicle over After January 1, 1982 80 dBA <br /> 10,000 pounds GVWR <br /> excluding buses <br /> All buses over 10,000 After January 1, 1980 85 dBA <br /> pounds GVWR <br /> All buses over 10,000 After January 1, 1983 83 dBA <br /> pounds GVWR <br /> All buses over 10,000 After January 1, 1986 80 dBA <br /> pounds GVWR <br /> Any motor vehicle 10,000 After January 1, 1976 80 dBA <br /> pounds GVWR or less <br /> Motorcycles After January 1. 1976 83 dBA <br /> Motorcycles After January 1, 1986 80 dBA <br /> 70 <br />