No person having control or charge of a motor vehicle shall allow such vehicle to stand unattended on a highway without first stopping the motor of such vehicle, locking the ignition, removing the key from the ignition and effectively setting the brakes thereon and, when standing upon any roadway, turning the front wheels of such vehicle to the curb or side of such roadway.
(Neb. RS 60-6,168) Penalty, see § 72.99