Vehicles may not contain sound systems which allow someone to hear noise outside the vehicle.

Section 9.07.010 Raucous Noise.

No driver of a vehicle shall operate or permit operation of any radio system intended to make sound audible outside the vehicle when the vehicle is being operated upon a highway, unless such system is being operated to request assistance or warn of a hazardous situation. This section shall not apply to authorized emergency vehicles or vehicles operated by gas, electric, communications, or water utilities. This section shall not apply to the radio systems of vehicles used for advertising, or in parades, political or other special events, except that use of radio systems on such vehicles may be prohibited by a local authority by ordinance or resolution.

(Ord. 590, 1989)