Any person violating this section, whether as principal, agent, or employee, shall be guilty of a misdemeanor, and, upon conviction thereof, shall be punished by a fine of not less than twenty-five nor more than one hundred dollars; and such person shall be deemed guilty of a separate offense for each day during any portion of which any violation of this section is committed or continued. Every such prohibited sign or other marking is hereby declared to be a public nuisance. Upon receiving notice of any violation of this section, the commissioner shall cause the prohibited sign or other marking to be removed within ten days and shall cause the appearance of the property on which it was affixed to be restored, as near as may be practicable, to its condition immediately before such violation occurred. The commissioner shall, in the name of the state, recover from the persons who hereafter violate this section the amounts expended by the state in removing the sign or other marking and in restoring the appearance of the property on which it was affixed.
The commissioner is empowered to remove any such prohibited sign or other marking in place upon or over any road taken over by him for construction or maintenance.