Okla. Stat. tit. 47, § 47-12-211: Visibility of reflectors, clearance lamps and marker

lamps.

A. Every reflector upon any vehicle referred to in Section 12-

208 of this title shall be of such size and characteristics and so

maintained as to be readily visible at nighttime from all distances

within six hundred (600) feet to one hundred (100) feet from the

vehicle when directly in front of lawful lower beams of headlamps.

B. Front and rear clearance lamps shall be visible at nighttime

from a distance of one thousand (1,000) feet from the front and

rear, respectively, of the vehicle.

C. Side marker lamps shall be visible at nighttime from a

distance of one thousand (1,000) feet from the sides of the vehicles

on which mounted.