(a) At all times specified in section two of this article at least two lighted lamps shall be displayed, one on each side at the front of every motor vehicle other than a motorcycle, motor-driven cycle or moped, except when such vehicle is parked subject to the regulations governing lights on parked vehicles.

(b) Whenever a motor vehicle equipped with head lamps as herein required is also equipped with any auxiliary lamps or a spot lamp or any other lamp on the front thereof projecting a beam of intensity greater than three hundred candlepower, not more than a total of four of any such lamps on the front of a vehicle shall be lighted at any one time when upon a highway.