The administrator of the division of motor vehicles, department of revenue is authorized to adopt and enforce those rules and regulations that may be necessary to carry out the provisions of chapters 1 - 27 of this title, and any other laws the enforcement and administration of which are vested in the division of motor vehicles, including rules and regulations concerning specialized testing and standards for operators of commercial vehicles; provided, however, that nothing contained in this section shall be construed to authorize the administrator to charge any monetary fee for a license or permit to utilize a flashing light by any volunteer fire department or volunteer ambulance squad.
R.I. Gen. Laws § 31-2-4