Okla. Stat. tit. 69, § 69-4025: Rules and regulations

A. The Department of Transportation shall issue rules and

regulations in accordance with the Administrative Procedures Act,

Section 301 et seq. of Title 75 of the Oklahoma Statutes, to

implement this program.

B. Pursuant to subsection A of this section, the Oklahoma

Department of Transportation shall not prevent sign placement by

contract or by rule in any county with a population of less than

five hundred thousand (500,000) people according to the most recent

Federal Decennial Census; provided however, nothing in this section

shall prohibit the Department from allowing such sign placement in

any county with a population of more than five hundred thousand

(500,000) people.