Wyoming vehicle lighting laws

Below are all relevant excerpts from Wyoming Vehicle Code that limit, restrict or allow certain aftermarket lights to be installed on vehicles.

31-5-901.  General requirements; applicability of provisions.

[…] (b)  Nothing contained in this act shall prohibit equipment required by the United States Department of Transportation nor the use of additional parts and accessories on any vehicle not inconsistent with the provisions of this act. […]

This provision is important to note as it essentially permits using underglow as long as it’s not in violation of other laws and regulations.

§ 31-5-917.  Color of lighting devices.

All lighting devices and reflectors mounted on the rear of any vehicle shall display or reflect a red color, except the stop light or other signal device, which may be red or yellow, and except that the light illuminating the license plate shall be white and the light emitted by a backup lamp shall be white.

§ 31-5-928.  General lighting restrictions; authorized emergency vehicles.

[…] (b) Except as required in W.S. 31-5-929 and this section, no person shall drive or move any vehicle or equipment upon any highway with any lamp or device thereon capable of displaying a red light or blue light visible from directly in front of the center thereof.

(c) Flashing lights are prohibited except as authorized […]

(d) Every authorized emergency vehicle, except police vehicles and as otherwise specified in this subsection, shall, in addition to any other equipment required by law, be equipped with at least one (1) red lamp visible from five hundred (500) feet in front of the vehicle. Except as otherwise provided in this subsection, every authorized emergency vehicle, may be equipped with one (1) or more blue, white or amber lights. Vehicles used by the department to clear snow from public highways may be equipped with one (1) or more lights of a conspicuous color as specified by rules adopted by the department. Privately-owned vehicles used by members of a fire department or emergency service organization in performing or traveling to perform assigned duties in those organizations shall display at least one (1) flashing white, red or amber light, but no blue lights, visible from five hundred (500) feet in front of the vehicle.

Penalties

As per Article 31-5-901, violating vehicle equipment regulations is considered a misdemeanor.

31-5-901.  General requirements; applicability of provisions.

(a)  It is a misdemeanor for any person to drive or move or for the owner to cause or knowingly permit to be driven or moved on any highway any vehicle or combination of vehicles which is in such unsafe condition as to endanger any person, or which does not contain those parts or is not at all times equipped with such lamps and other equipment in proper condition and adjustment as required in this act, or which is equipped in any manner in violation of this act, or for any person to do any act forbidden or fail to perform any act required under this act.

Violation of vehicle lighting equipment laws in Wyoming is considered a misdemeanor.