The words “City of Cleveland” shall be painted plainly visible on the outside of the body of each motor vehicle owned by the City. The letters of these words shall be at least four (4) inches in the least dimension, and the color shall contrast with the color of the vehicle body. Motor vehicles used by the Division of Police in the detection and the suppression of crime shall be exempt from the provisions of this section.
No person shall operate a City vehicle which is not lettered as prescribed herein.