Wyo. Stat. § 31-5-932 (2026)

(a) No person shall have for sale, sell or offer for sale
for use upon or as a part of the equipment of a motor vehicle,
trailer, semitrailer, motorcycle, autocycle, motor-driven cycle,
moped or pole trailer, or use upon the vehicle any head lamp,
auxiliary or fog lamp, rear lamp, signal lamp or reflector,
which reflector is required by this article, or parts of any of
the foregoing which tend to change the original design or
performance, unless of a type which has been submitted to the
superintendent and approved by him. This section does not apply
to equipment in actual use prior to January 1, 1956, or
replacement parts therefor.

     (b) No person shall have for sale, sell or offer for sale
for use upon or as a part of the equipment of a motor vehicle,
trailer, semitrailer or pole trailer any lamp or device
mentioned in this section which has been approved by the
superintendent unless the lamp or device bears thereon the
trade-mark or name under which it is approved so as to be
legible when installed.

     (c) No person shall use upon any motor vehicle, trailer,
semitrailer or pole trailer any lamps mentioned in this section
unless the lamps are mounted, adjusted and aimed in accordance
with instructions of the superintendent.