A. A motor vehicle when operated on a highway shall be equipped with a horn that is
in good working order and that is capable of emitting sound audible under normal
conditions from a distance of at least two hundred feet. Any horn or other warning
device shall not emit an unreasonably loud or harsh sound or a whistle.
B. If reasonably necessary to ensure the safe operation of a motor vehicle, the
driver shall give an audible warning with the driver's horn but shall not otherwise use
the horn when on a highway.
C. A vehicle shall not be equipped with and a person shall not use on a vehicle a
siren, whistle or bell, except as otherwise permitted in this section.
D. A vehicle may but is not required to be equipped with a theft alarm signal
device that is arranged so that it cannot be used by the driver as an ordinary warning
E. An authorized emergency vehicle may be equipped with a siren, whistle or bell
that is capable of emitting sound audible under normal conditions from a distance of at
least five hundred feet and that is of a type approved by the department. The siren shall
not be used except when the vehicle is operated in response to an emergency call or in
the immediate pursuit of an actual or suspected violator of the law or when necessary to
serve a civil traffic complaint. During these events the driver of the vehicle shall
sound the siren when reasonably necessary to warn pedestrians and other drivers of the
approach of the emergency vehicle.
F. A siren shall be allowed on a fire engine that is solely used for hobby or
display purposes and that has been issued a historic vehicle license plate pursuant to
section 28-2484 if either of the following applies:
1. The siren is covered and is not activated while a person is transporting or
driving the vehicle to or from a parade, authorized assemblage of historic vehicles or
2. The siren is activated only in a parade, for an authorized assemblage of
historic vehicles or for testing purposes.