Except as hereinafter provided, the headlamps, the auxiliary low-beam lamps, or the auxiliary driving lamps, or combinations thereof, on motor vehicles shall be so arranged that the driver may select at will between distributions of light projected to different elevations, subject to the following requirements and limitations:

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(a) There shall be an uppermost distribution of light, or composite beam, so aimed and of such intensity as to reveal persons and vehicles at a distance of at least 350 feet ahead for all conditions of loading.

(b) There shall be a lowermost distribution of light, or composite beam, so aimed and of sufficient intensity to reveal persons and vehicles at a distance of at least 100 feet ahead; and on a straight level road under any condition of loading none of the high-intensity portion of the beam shall be directed to strike the eyes of an approaching driver.

(c) All road-lighting equipment manufactured and installed on and after January 1, 1938, shall be so arranged that when any beam is used which is not in conformity with paragraph (b), means shall be provided for indicating to the driver when such beams are being used.