Idaho Statutes Title 49. Motor Vehicles § 49-928. Special restrictions on lamps

(1) Any lighted lamp or illuminating device upon a motor vehicle, other than head lamps, spot lamps, auxiliary lamps, or flashing turn signals, emergency vehicle warning lamps, and school bus warning lamps, which projects a beam of light of an intensity greater than three hundred (300) candlepower shall be so directed that no part of the high-intensity portion of the beam will strike the level of the roadway on which the vehicle stands at a distance of more than seventy-five (75) feet from the vehicle.

(2) No person shall drive or move any vehicle or equipment upon any highway with any lamp or device displaying a red light visible from directly in front of the center of the vehicle or equipment. This section shall not apply to any vehicle upon which a red light visible from the front is expressly authorized or required by this title.

(3) As a practical means of determining whether head lamps or auxiliary driving or fog lamps glare the following test shall apply: Any such lamp shall be deemed to be glaring if any part of the main beam strikes the body of a person, vehicle, screen or other object higher than the lamp centers twenty-five (25) feet or more ahead of the vehicle and in no event shall the main bright portion of the beam be higher than forty-two (42) inches at a distance of seventy-five (75) feet ahead of the vehicle.

(4) Flashing lights are prohibited except on an authorized emergency vehicle, school bus, snow removal equipment, or on any vehicle as a means for indicating a right or left turn, or the presence of a vehicular traffic hazard requiring unusual care in approaching, overtaking or passing.