It shall be unlawful for any person to park any motor vehicle in or on any section of any public park, playground, play lot, or tot lot within the city not designed as a parking area or designed and regularly maintained as a roadway. However, nothing contained in this section shall be construed as prohibiting the parking of a motor vehicle parallel to a designated and regularly maintained roadway in any such park or playground where at least two wheels of the motor vehicle are resting on such roadway.
(`91 Code, § 72.10) Penalty, see § 72.99