No holder shall employ or allow, permit or suffer any driver to operate or be in charge of a taxicab owned or controlled or possessed by such holder unless such driver possesses a taxicab driver's license duly issued by the chief of police. Such license shall be displayed in such taxicab at all times when it is operated by such driver in such place as to be readily visible and legible to any passengers.
(Code 1954 § 21.31; Ord. 1772 § 1)