N.Y.C. Admin. Code § 20-507: § 20-507 Posting of information.

a. Every person holding a license to engage in towing shall post, in a conspicuous fashion at the area of the licensee's place of business where a vehicle may be claimed, a sign which clearly and legibly states the licensee's name, address and business telephone number, the license number assigned to such business, the rates permitted to be charged for towing and storage under section 20-509 of this subchapter and the department's telephone complaint number.

b. The following information shall be clearly and legibly displayed and affixed in the manner provided by rule on each side of every tow truck used under a license to engage in towing: the licensee's name, the address under which the tow truck is licensed with the department, and the business telephone number; such rates permitted to be charged for towing and for storage under section 20-509 of this subchapter as are specified in rules of the commissioner; 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 in a contrasting color which is prominent against the background color and is conspicuously visible when such vehicle is in motion.