Any person, when hunting with dogs is permitted, may post along highways not more than 2 signs reading “Caution Hunting Dogs”. These signs shall be 12 inches wide by 12 inches high with blaze orange letters on a yellow background and must be 40 inches over-all height, and shall be posted no more than 1,000 feet apart. Such hunter shall bear the cost and maintenance of his signs and shall not block driveways, intersections or rights of way with said signs. No such signs shall be posted on private roads or lands without permission of the owner. When not hunting, the owner of said signs shall remove the same.