It shall be unlawful to park any vehicle on or along any preferential streets except at the places and in the position as may be indicated by proper lines or silent policeman on the streets, and in no event shall any vehicle be so parked upon any streets so as to use or occupy more than 15 feet in width of the street. (`84 Code, § 8-27) (Ord. 206, passed 4-9-30) Penalty, see § 72.99