(A) Every person owning and operating a taxicab under license from the city, may adopt any trade name, design, color scheme, or method of painting or lettering such taxicabs that is approved by the director of public service and safety. Such trade name, design, color scheme, or method of painting or lettering shall include the following matter:
(1) A serial number assigned by the director of public service and safety to each taxicab, and painted on each side and on the rear of the taxicab;
(2) The name of the owner, or the trade name under which he does business, painted on each side and the rear of the taxicab. Whenever the name of the owner or the trade name under which he does business does not include any one of the words "taxicab," "taxi," or "cab," then the word "taxicab" shall be painted on each side of the taxicab immediately beneath said name or trade name.
(B) All mandatory lettering and wording, whether in a particular trade name design, color scheme, method of painting or lettering or otherwise, as hereinbefore provided, shall be at least 4 inches in height, and shall be of such color as in the opinion of the director of public service and safety will contrast distinctly with the color of the body of the taxicab.
('59 Code, § 761.09) Penalty, see § 115.99