It shall be unlawful to operate upon any of the public highways of this State any two-wheeled timber carts with tongue or small wheel attached thereto which comes in contact with the road, and it shall also be unlawful to operate any vehicle over any such highway for the purpose of carrying timber or other loads by which timber or any other character of load is allowed to strike or drag the surface of the road. But this provision does not apply to four-wheeled lumber carts when the load is so suspended as not to come in contact with the road. A violation of this section shall be punishable by a fine of not more than one hundred dollars or imprisonment for not more than thirty days.