1.    No person may 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 hides from view or interferes with the effectiveness of an official traffic-control device or any railroad sign or signal.

2.    No person may place or maintain nor may any public authority permit upon any highway any traffic sign or signal bearing thereon any commercial advertising.

3.    This section may 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.

4.    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 when located on highway right of way.

5.    No person may place, maintain, or display upon or within the right of way of any highway any sign, post, pole, mailbox, or signal which has a red lamp or red reflector visible to traffic. The provisions of this subsection do not apply to official traffic devices, lamps, or reflectors on motor vehicles or bicycles, or railroad signals or signs.

6.    This section does not prohibit the use of portable battery-powered warning devices emitting a flashing red light placed upon a highway to alert oncoming traffic to a disabled or stopped motor vehicle.