Vt. Stat. Ann. tit. 23, § 1111

No person shall permit a motor vehicle to stand unattended without first stopping the engine; locking the ignition; removing the key from the ignition and effectively setting the brake, air temperatures permitting; and, when the vehicle is standing upon a grade, turning the front of the front wheels toward the curb or side of the highway. This section does not apply to authorized emergency vehicles.