16 Guam Code Ann. § 3207
(b) The operator of a motor vehicle, when reasonably necessary to insure safe operation, shall give audible warning with his horn. Such horn shall not otherwise be used.
(c) No vehicle shall be equipped with, nor shall any person use upon a vehicle operated on a highway, any siren except as authorized by the Chief of Police. Any authorized emergency
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16 Guam Code Ann. VEHICLES
CH. 3 GENERAL PROVISIONS
vehicle may be equipped with a siren of a type approved by the Chief of Police but such siren shall not be used except when such vehicle is operated in response to an emergency call or when responding to a fire alarm or in the immediate pursuit of an actual or suspected violator of the law in which said latter events, the driver of such vehicle shall sound said siren when necessary to warn pedestrians and other drivers of the approach thereof.
SOURCE: GC § 23108, enacted by P.L. 1-088 (Nov. 29, 1952), repealed and reenacted by P.L. 3-016 (July 14, 1955).