Section 39-21-25 - Number of driving lamps required or permitted1. At all times specified in section 39-21-01 at least two lighted lamps must be displayed, one on each side at the front of every motor vehicle, except when a vehicle is parked subject to the regulations governing lights on parked vehicles.2. Whenever a motor vehicle equipped with headlamps 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 may be lighted at any one time when upon a highway.