634.12 MOTOR VEHICLE OPERATION.
   (a)    No motor vehicle operating on the public right of way or on private property shall exceed the maximum sound level of eighty dBA. However, for vehicles over a gross vehicle weight of 8,000 pounds on a State highway, a prescribed truck route or in a commercial or industrial zone that is not adjacent to a residential zone, the maximum sound level shall not exceed eighty-eight dBA.
   (b)    Whoever violates this section is guilty of a minor misdemeanor for a first offense and a misdemeanor of the fourth degree for any subsequent offense. Punishment shall be as provided in Section 698.02. (Ord. 77-83. Passed 9-20-83.)