No person having control or charge of a motor vehicle shall park or angle park such vehicle on any street unattended without first setting the brakes and stopping the motor of the vehicle and, when parked upon a perceptible grade, without turning the wheels of such vehicle to the curb or the side of the street or highway, so that in the event of release of the brakes such vehicle will not move. (Ord. 5212 § 1 (Exh. F), 1999; 1957 code § 9.22.070.)