Sec. 2. (a) Except as provided in subsection (b) and section 8 of this chapter, each vehicle upon a highway:
(1) between the time from sunset to sunrise; and
(2) 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;
must display lighted head lamps and other illuminating devices as required for different classes of vehicles under this chapter.
(b) All lamp equipment required for vehicles described in IC 9-19-6, including each tail lamp required by law, shall be lighted at the times mentioned in subsection (a), except that clearance and sidemarker lamps are not required to be lighted on a vehicle when the vehicle is operated within a municipality if there is sufficient light to render clearly discernible persons and vehicles on the highway at a distance of five hundred (500) feet.