Notwithstanding any other provisions of this title, a person may not operate a motorcycle that has a motor with a rating of 1.5 brake horsepower or less, or a capacity of less than 70 cubic centimeters piston displacement: On a roadway where the posted maximum speed limit is more than 50 miles per hour; or On any expressway or other controlled access highway. Prior to the sale of such vehicle, any dealer or agent or employee of a dealer, any vehicle salesman, or other person who sells a motorcycle as defined in this subsection shall inform the buyer of the operating restrictions imposed by this section. The Administration may provide a warning of the operating restrictions imposed by this subsection.