a. It shall be unlawful to operate a taxicab or vehicle for hire within the City which does not have printed or placed upon the exterior of the taxicab or vehicle for hire in a visible, clear and conspicuous location the name and telephone number of the operator. All such lettering shall be in letters not less than two (2") inches in height and of a color in contrast to the color of the taxicab or vehicle for hire. In addition, the dome light markings shall read the same as the operator’s name or fictitious name written upon the vehicle or only shall read “Taxi.” In addition, every taxicab or vehicle for hire shall have printed or placed upon the exterior in conspicuous letters of the same color not less than three and one half inches in height, of a color in contrast to the color of the taxicab or vehicle for hire, the number of such taxicab or vehicle for hire, which numbering shall be printed or placed on each side of the vehicle on the leading edge of the front door and on the rear of the trunk.