THE NEXT BIG THING
Montana Laws Regarding
Over glow and Under glow lights
Montana law does specifically mention neon underglow or overglow being allowed. Therefore it’s our conclusion that in Montana neon underglow or overglow is not illegal, according to the following restrictions:
No flashing, rotating, or oscillating lights are permitted.
Colors blue, red, and green are prohibited.
License plate illumination must be white
Green, blue and red colors are typically used on emergency vehicles, and expressly forbidden by MT law which otherwise permits underbody glow.
If the vehicle is not on a highway or public road, all car underglow colors are legal for use.
(1) Any motor vehicle may be equipped with not more than two side cowl or fender lamps which shall emit an amber or white light without glare.
(2) Any motor vehicle may be equipped with not more than one running board courtesy lamp on each side thereof which shall emit a white or amber light without glare.
(3) Any motor vehicle may be equipped with not more than two backup lamps either separately or in combination with other lamps, but any such backup lamps shall not be lighted when the motor vehicle is in forward motion.
(4) Any vehicle may be equipped with lamps which may be used for the purpose of warning the operators of other vehicles of the presence of a vehicular traffic hazard […] shall display simultaneously flashing white or amber lights, or any shade of color between white and amber.