§ 71.39 UNATTENDED VEHICLE.
   No person operating or in charge of a motor vehicle shall permit it to stand unattended without first stopping the engine, locking the ignition and removing the key, nor allow it to stand upon any perceptible grade without effectively setting the brake and turning the front wheels to the curb or side of the highway.
(KRS 189.430 (3)) Penalty, see § 71.99