Georgia Code Title 40. Motor Vehicles and Traffic § 40-8-70

(a) Every motor vehicle when operated upon a highway shall be equipped with a horn in good working order and capable of emitting sound audible under normal conditions from a distance of not less than 200 feet, but no horn or other warning device shall emit an unreasonably loud or harsh sound or a whistle. The driver of a motor vehicle shall, when it is reasonably necessary to ensure safe operation, give audible warning with his or her horn but shall not otherwise use such horn when upon a highway.

(b) No vehicle shall be equipped with nor shall any person use upon a vehicle any siren, whistle, or bell except as otherwise permitted in this Code section and Code Section 40-8-94.

(c) No vehicle shall be equipped with a theft alarm signal device which is so arranged that it can be used by the driver as an ordinary warning signal.