Neb. Rev. Stat. § 60-6,168

No person having control or charge of a motor vehicle shall allow such vehicle to stand unattended on a highway without first: (1) Stopping the motor of such vehicle; (2) except for vehicles equipped with motor starters that may be actuated without a key, locking the ignition and removing the key from the ignition; (3) effectively setting the brakes thereon; and (4) when standing upon any roadway, turning the front wheels of such vehicle to the curb or side of such roadway.