All automobiles, trucks, trailers or other vehicles operated by any licensee for the transportation of the equipment used by a licensee in the business of planting, cutting, trimming, pruning, removing, spraying or otherwise treating trees, shrubs or vines or applying herbicides, weedicides, insecticides, fungicides, soil conditioners or fertilizers within the City, and all self-propelled, drawn or tow equipment used by any licensee in such business, shall have the name and address of such licensee displayed on both sides thereof in plain and legible figures and letters not less than three inches in height, which shall be kept in such condition as to permit such letters and figures to be readily distinguished and read at a distance of at least 60 feet, and it shall be unlawful and grounds for revocation of the license for any licensee to operate any such vehicle or cause any such equipment to be operated or drawn or towed upon the streets, alleys or any public ways or places within the City unless or without the same being so displayed thereon. (Code 1981 § 45-76. Code 1995 § 150-96.)