No driver of a two (2) or three (3) wheel motor vehicle shall carry any other person on, upon or within such vehicle on any street or highway in the city, except as hereinafter provided; provided, however, that if any two (2) or three (3) wheel motor vehicle with a wheel diameter of twelve inches (12") or greater shall have either a double seating device with double footrests or a sidecar attachment providing a separate seat space with such sidecar for each person riding therein so that such person shall be seated entirely within the body of said sidecar, then it shall be permissible for an operator who has attained the age of sixteen (16) years or older to carry a passenger. A demonstration ride by a licensed dealer or his employee is excepted from the provisions hereof. (2010 Code § 21-96)