It shall be unlawful to park or to allow a motor vehicle to stand on any highway unattended without first setting the brakes thereon and stopping the motor thereof, and without turning the wheels of such vehicle to the curb or side of the highway if it is standing upon a slope.
('91 Code, § 76.11)  (Ord. 1901-1954, passed 1-21-54)  Penalty, see § 70.99