Okla. Stat. tit. 69 § 1330
Any county or city shall have authority to pay all or any part of the cost of acquiring all or any part of any right-of-way necessary for the establishment of any such "limited access facilities" out of general funds or the proceeds of bonds voted for such purpose, whether such right-of-way is within or without the corporate limits of any such city; provided such limited access facility or part thereof shall have been previously designated by the board of county commissioners and the county planning commission of such county, or by the governing body of the city and the city planning commission of the city, as the case may be, or by all the same, as a necessary part of a comprehensive plan for a system of streets or highways for the adequate movement of traffic in, out, through or around such county or city.
Okla. Stat. tit. 69, § 1330