Okla. Stat. tit. 47, § 180e
The Commission, in its discretion, is authorized to provide for decals, cab cards, or other suitable methods of identification to be displayed on or carried in the truck or powered motor vehicle.
Laws 1939, HB 650, p. 59, § 7; Amended by Laws 1968, HB 1114, c. 190, § 19, eff. September 30, 1968; Amended by Laws 1971, HB 1266, c. 102, § 4, emerg. eff. April 26, 1971.