Utah Code § 41-6a-309: Prohibition of unauthorized signs, signals, lights, or markings -- Commercial advertising -- Public nuisance -- Removal.

(1) Except as provided in Section 41-6a-310, a person may not place, maintain, or display upon or in view of any highway any unauthorized sign, signal, light, marking, or device which:

(a) purports to be or which resembles a traffic-control device or railroad sign or signal, or authorized emergency vehicle flashing light;

(b) attempts to direct the movement of traffic;

(c) hides from view or interferes with the effectiveness of a traffic-control device or any railroad sign or signal; or

(d) blinds or dazzles an operator on any adjacent highway.

(2) Except as provided under Section 72-7-504 regarding logo advertising, a person may not place or maintain any commercial advertising on any traffic-control device.

(3) The provisions of Subsections (1) and (2) do not prohibit a sign on private property adjacent to a highway providing directional information in a manner that may not be mistaken for a traffic-control device.

(4) Every prohibited sign, signal, or light, or marking is a public nuisance and the highway authority having jurisdiction over the highway may remove it or cause it to be removed without notice.

(5) A violation of this section is an infraction.