Okla. Stat. tit. 47, § 47-11-206: Display of unauthorized signs, signals or markings

(a) No person shall place, maintain or display upon or in view

of any highway any unauthorized sign, signal, marking or device

which purports to be or is an imitation of or resembles an official

traffic-control device or railroad sign or signal, or which attempts

to direct the movement of traffic, or which projects any flashing or

revolving beams of light, or which hides from view or interferes

with the effectiveness of any official traffic-control device or any

railroad sign or signal, and no person shall place or maintain nor

shall any public authority permit upon any street or highway any

traffic sign or signal bearing thereon any commercial advertising;

provided, however, that the governing board of any city or town may

permit, under such conditions as the said board may deem proper,

commercial or other advertising upon any traffic sign located on

streets or highways within said city or town and not designated as

either state or federal highways or extensions thereof.

(b) This section shall not be deemed to prohibit the erection

upon private property adjacent to highways of signs giving useful

directional information and of a type that cannot be mistaken for

official signs.

(c) Every such prohibited sign, signal or marking is hereby

declared to be a public nuisance and the authority having

jurisdiction over the highway is hereby empowered to remove the same

or cause it to be removed without notice.