Okla. Stat. tit. 47 § 180g
It shall be the duty of the Commission to provide identification devices upon written application of any authorized motor carrier.
Upon written application of any authorized motor carrier holding a certificate or permit or license issued by the Commission, the Commission shall issue to the motor carrier a sufficient number of identification devices so that each powered vehicle owned or to be operated by the motor carrier in the state shall bear one identification device. Identification devices shall be issued on an annual basis, and applications shall be made annually on the form prescribed by the Commission, and any motor carrier operating a powered vehicle without a current identification device shall be in violation of the provisions of Sections 180 through 180m of this title or the Motor Carrier Act of 1995.
It is hereby declared unlawful for any motor carrier, or agents or employees of any motor carrier, to use or transfer an identification device except as provided by rules of the Commission.
Okla. Stat. tit. 47, § 180g