(a) A person may operate a low-speed gas bicycle only if the person is at least 16 years of age.
     (b) A person may not operate a low-speed gas bicycle at a speed greater than 20 miles per hour upon any highway, street, or roadway.
     (c) A person may not operate a low-speed gas bicycle on a sidewalk.
     (d) Except as otherwise provided in this Section, the provisions of this Article XV that apply to bicycles also apply to low-speed gas bicycles.