MSHA - Code of Federal Regulations - 30 CFR 57.14207
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MSHA - Title 30 CFR
30 CFR § 57.14207
Parking procedures for unattended equipment.


Mobile equipment shall not be left unattended unless the controls are placed in the park position and the parking brake, if provided, is set. When parked on a grade, the wheels or tracks of mobile equipment shall be either chocked or turned into a bank or rib.