Each governing body shall have authority to designate and establish limited access facilities as new and additional highways, or may designate any existing street or highway as a limited access facility. The governing body shall have authority to provide for the elimination of intersections at grade of limited access facilities with any highway, road, street, or alley now or hereafter existing, either by grade separation, or by closing off such other highway, road, street or alley, or by otherwise protecting such limited access facility.
Okla. Stat. tit. 69, § 1302