4 Va. Admin. Code § 25-40-1510
Mobile equipment shall not be left unattended unless the brakes are set. Mobile equipment with wheels or tracks, when parked on a grade, shall be either blocked or turned into a bank or rib unless the bucket or blade lowered to the ground prevents movement.
§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.
Derived from VR480-05-1.2 § 9.22, eff. July 19, 1989.