16 Tex. Admin. Code § 35.3
(b) Each vehicle covered by a private carrier's permit or a local cartage permit shall have painted or printed in a conspicuous place on such vehicle the following letters and numerals, each letter and numeral being not less than 1 1/2 inches in height and the correct permit number being inserted in the blank space. Such letters and numerals shall never be covered from public view when such vehicle is being used in the alcoholic beverage business.
Source Note:The provisions of this §35.3 adopted to be effective January 1, 1976.