Minn. Stat. § 219.29: PROHIBITED SIGN.

Subdivision 1. Obstructing sign.

No person, firm, or corporation shall place or maintain any advertising sign or other similar obstruction upon, over, or adjacent to a highway between an approach sign and the grade crossing which it marks.

Subd. 2. Resembling sign.

No person, firm, or corporation shall place or maintain upon, over, or adjacent to a public highway any sign or symbol resembling the signs provided for in sections 219.16 to 219.30.