Any person who is the owner or who becomes the owner of any motor vehicle originally designed for use primarily as an ambulance and who ceases to use such vehicle for its original or former purpose shall remove therefrom all exterior indication of and all exterior equipment solely used or related to the original or former use of such vehicle. The provisions of this section shall not apply to any motor vehicle registered as an antique, rare or special interest motor vehicle, in accordance with section 14-20.