Each limousine carrier which registers any vehicle under this article shall, for each such certificated vehicle, affix to the center of the front bumper of each such certificated vehicle a standard size license plate bearing the following information: (1) limousine company name, (2) city and state of principal domicile, (3) company telephone number, and (4) the vehicle classification, IE-1. The cost for such license plate shall be the sole responsibility of the limousine carrier and must be placed on each certificated vehicle prior to said vehicle being placed in service and no later than May 1, 1994, for all such vehicles currently owned and to be registered and operated by a limousine carrier.