Vehicle warning lights

Maine requires vehicles engaged in snow removal or sanding operations on a public way to be equipped with and display at least two auxiliary lights mounted at the highest practical point on the vehicle and provide visible light coverage over a 360 degree range. The lights must emit an amber beam of light, be at least 6 inches in diameter and be equipped with blinking attachments. In lieu of the lights specified, a vehicle may be equipped with at least one auxiliary rotating flashing light having 4 inch sealed beams and showing amber beams of light over a 360 degree range or an amber strobe, or combination of strobes, that emits at a minimum a beam of 1,000,000 candlepower and provides visible light coverage over a 360 degree range. When the left wing of a plow is in operation and extends over the center of the road, an auxiliary light must show the extreme end of the left wing. The light may be attached to the vehicle so that the beam of light points at the left wing. The light illuminating the left wing may be controlled by a separate switch or by the regular lighting system and must be in operation at all times when the vehicle is used for plowing snow on public ways.

Also by state statute: “A vehicle engaged in highway maintenance may be equipped with auxiliary lights that emit an amber light.”