§47-12-201.

§47-12-201.
   
   Except as otherwise provided in this section, every vehicle upon a
   highway within this state at any time from a half hour after sunset to
   a half hour before sunrise and at any other time when, due to
   insufficient light or unfavorable atmospheric conditions, persons and
   vehicles on the highway are not clearly discernible at a distance of
   five hundred (500) feet ahead shall display lighted lamps and
   illuminating devices as hereinafter respectively required for
   different classes of vehicles, subject to exceptions with respect to
   parked vehicles. Every motorcycle and every motor-driven cycle upon a
   highway within this state, except motorcycles and motor-driven cycles
   used in official law enforcement capacities, shall display lighted
   lamps and illuminating devices at all times.