a. No person shall engage in any activity for which a distributor's license is required unless the motor vehicle used therefor is identified in the manner prescribed by law or regulation.
b. Any vehicle used by a distributor to transport goods to a general vendor must be visually identified by a sign conspicuously displayed on the side of the vehicle. The following information shall be clearly and legibly displayed on such sign: the licensee's name, address, and business telephone number; the words "General Vending Distributor"; and the department's telephone complaint number. The letters and numerals of such display shall not be less than one and one-half inches in height, with a width of at least one-quarter of an inch, and shall be colored black or white, whichever is most prominent against the background color.
c. Signs used to identify delivery vehicles may be removable, but must be securely fastened whenever the vehicle is used to deliver or remove goods to or from a general vendor. The sign must remain securely attached throughout the time it takes to load or unload goods.