Okla. Stat. tit. 47, § 1115.2

Preemption of orders, ordinances, or regulations of municipalities or other political subdivisions - Exceptions. A. The Legislature hereby occupies and preempts the entire field of legislation in this state touching in any way the enforcement of registration and licensing of automobiles to the complete exclusion of any order, ordinance, or regulation by any municipality or other political subdivision of this state. Any existing or future orders, ordinances, or regulations in this field, except as provided for in subsection B of this section, are null and void. B. Nothing contained in this section shall prohibit any order, ordinance, or regulation of any municipality from enacting and enforcing laws prohibiting and penalizing conduct prohibited by Sections 1101 through 1151.1 of Title 47 of the Oklahoma Statutes, but the provisions of such order, ordinance, or regulation by a municipality shall not be more stringent than those of the Oklahoma Vehicle License and Registration Act.