Wyo. Stat. § 31-5-952 (2026)

(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 two hundred (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 reasonably
necessary to insure safe operation give audible warning with his
horn but shall not otherwise use the 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 section.

     (c) Any vehicle may be equipped with a theft alarm signal
device which is so arranged that it cannot be used by the driver
as an ordinary warning signal. The theft alarm signal device
may use a whistle, bell, horn or other audible signal but shall
not use a siren.

     (d) Every authorized emergency vehicle, except wreckers,
shall be equipped with a siren, whistle or bell, capable of
emitting sound audible under normal conditions from a distance
of not less than five hundred (500) feet and of a type approved
by the superintendent, but 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, in which case the driver of the vehicle shall sound the
siren when reasonably necessary to warn pedestrians and other
drivers of the approach thereof.

     (e) This section applies to motorcycles, motor-driven
cycles, multipurpose vehicles, mopeds and off-road recreational
vehicles as defined by W.S. 31-1-101(a)(xv)(K)(II) that are
registered pursuant to W.S. 31-2-232 and off-road recreational
vehicles as defined by W.S. 31-1-101(a)(xv)(K) that are operated
pursuant to W.S. 31-5-1601.