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IDAHO STATUTES AND CODES
49-924 SINGLE-BEAM ROAD-LIGHTING EQUIPMENT.
MOTOR VEHICLES
CHAPTER 9
VEHICLE EQUIPMENT
49-924. Single-beam road-lighting equipment. Head lamps arranged to provide a single distribution of light shall be permitted on motor vehicles manufactured prior to January 1, 1955, in lieu of multiple-beam road-lighting equipment specified in this chapter if the single distribution of light complies with the following requirements and limitations:
(1) The head lamps shall be so aimed that when the vehicle is not loaded, none of the high-intensity portion of the light shall at a distance of twenty-five (25) feet ahead project higher than a level of five (5) inches below the level of the center of the lamp from which it comes, and in no case higher than forty-two (42) inches above the level on which the vehicle stands at a distance of seventy-five (75) feet ahead.
(2) The intensity shall be sufficient to reveal persons and vehicles at a distance of at least two hundred (200) feet.