Okla. Stat. tit. 47, § 47-12-220: Back-up and vehicular hazard warning lamps

A. Any motor vehicle shall be equipped with not more than two

back-up lamps either separately or in combination with other lamps.

Any back-up lamp shall not be lighted when the motor vehicle is in

forward motion.

B. Every vehicle shall be equipped with vehicular hazard

warning lamps required for that vehicle at the time the vehicle was

manufactured by standards of the United States Department of

Transportation pursuant to 49 C.F.R., Section 571.108. Such lamps

shall be used for the purpose of warning the operators of other

vehicles of the presence of a vehicular traffic hazard requiring the

exercise of unusual care in approaching, overtaking or passing, and

when so equipped may display such warning in addition to any other

warning signals required by this title. The lamps used to display

such warning to the front shall be mounted at the same level and as

widely spaced laterally as practicable, and shall display

simultaneously flashing white or amber lights, or any shade of color

between white and amber. The lamps used to display such warning to

the rear shall be mounted at the same level and as widely spaced

laterally as practicable, and shall show simultaneously flashing

amber or red lights, or any shade of color between amber and red.

These warning lights shall be visible from a distance of not less

than five hundred (500) feet in normal sunlight.

C. Any vehicle may be equipped with one or more side marker

lamps and any such lamp may be flashed in conjunction with the turn

or vehicular hazard warning lamps.