A taxicab operator may adopt any trade name, design, color scheme, or method of painting or lettering taxicabs as is approved by the manager. However, such trade name, design, color scheme or method of painting or lettering shall include the following:
(a) An identification number painted on each side and on the rear of the taxicab.
(b) The name of the taxicab operator, or the trade name and the word "taxi" or "cab", painted on each side and on the rear of each taxicab.
All mandatory numbering, lettering and wording shall be of such color as in the opinion of the Manager will contrast distinctly with the color of the body of the taxicab. The identification numbers on sides and rear shall not be less than four inches (4") in height.
Wherever the word "paint" or "painted" is used in this Chapter, it shall mean the application of coloring maker in oil solution not in water solution, or in approved adhesive material. (1969 Code 113.07)