Cottage Grove police brief: Green lights on car lead to drug citation
August 30, 2012 at 2:21 am in South Washington County Bulletin
A Cottage Grove man learned the hard way that flashing green lights on a vehicle draw police attention. Continue Reading

Is there a law against flashing green lights on the undercarriage of a car?
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Just based on the article, the answer to your question would be yes if traveling on a public road or highway. The violations would be:
169.64 Sub 2 – Colored light
169.64 Sub 3 Flashing light (defined by 169.59 WARNING LIGHTS)
The law in Minnesota are very restrictive when it comes to vehicle lighting.
169.64 PROHIBITED LIGHTS; EXCEPTIONS.
Subdivision 1.Bright light.Any lighted lamp or illuminating device upon a motor vehicle, other than a headlamp, a spot lamp, or an auxiliary driving lamp, which projects a beam of light of an intensity greater than 300-candle power, shall be so directed that no part of the beam will strike the level of the roadway on which the vehicle stands at a distance of more than 75 feet from the vehicle.
Subd. 2.Colored light.Unless otherwise authorized by the commissioner of public safety, no vehicle shall be equipped, nor shall any person drive or move any vehicle or equipment upon any highway with any lamp or device displaying a red light or any colored light other than those required or permitted in this chapter.
Subd. 3.Flashing lights.Flashing lights are prohibited, except on an authorized emergency vehicle, school bus, bicycle as provided in section 169.222, subdivision 6, road maintenance equipment, tow truck or towing vehicle, service vehicle, farm tractor, self-propelled farm equipment, rural mail carrier vehicle, funeral home vehicle, or on any vehicle as a means of indicating a right or left turn, or the presence of a vehicular traffic hazard requiring unusual care in approaching, overtaking, or passing. All flashing warning lights shall be of the type authorized by section 169.59, subdivision 4, unless otherwise permitted or required in this chapter.
169.59 WARNING LIGHTS.
Subd. 4.Flashing warning light.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 requiring the exercise of unusual care in approaching, overtaking, or passing, and when so equipped may display such warning in addition to any other warning signals required by this section or section 169.50, subdivision 1 or 3; 169.56, subdivision 1, 2, 3, or 4; 169.57, subdivision 1; or 169.64, subdivision 3. The lamps used to display such warnings to the front shall be mounted at the same level and as widely spaced laterally as practicable, and shall display simultaneous flashing white or amber lights, or any shade of color between white and amber. The lamps used to display such warnings to the rear shall be mounted at the same level and as widely spaced laterally as practicable, and shall show simultaneously flashing amber or red lights, or any shade of color between amber and red. Instead of a pair of lamps that flash simultaneously, either one or two strobe lights or rotating beacon lights with an amber or yellow lens may be used both to the front and rear of the vehicle. These warning lights shall be visible from a distance of not less than 500 feet under normal atmospheric conditions at night.
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I mistated a bit in my first statement… I should have typed what I “believe” the violations to be.
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thanks David!
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