The following devices are exempt from the provisions of these regulations:
A. Aircraft (except model aircraft);
B. Police, fire, ambulance and other governmental emergency vehicles;
C. Back-up alarm devices on trucks and other equipment when installed and operated in accordance with Society of Automotive Engineers Recommended Practice J 994, “Criteria for Back-up Alarm Devices”; and
D. Governmental warning devices (i.e., civil defense or fire siren).
(Ord. 1969-2, passed 5-26-1969; Ord. 1989-1, passed 3-13-1989)