No vehicle designed or employed for the express purpose of advertising any exhibition, performance, article, or thing shall be permitted to park on any of the streets, lanes, or alleys included in the territory herein designated and described as the Central Business District. City Code, 1927, art. 4, §71 1950, art. 38, §23 1966, art. 31, §34 1976/83, art. 31, §23 Ord. 26-823