PART XXVIII GENERAL MINING REQUIREMENTS — Wheel chocks
536
(1) Wheel chocks shall be used to block movement whenever a motor vehicle
536(a)
is left unattended on a slope; or
536(b)
is being maintained or repaired.
536(2)
Wheel chocks shall comply with the requirements of the Society of Automotive Engineers Standard SAE J348 "Wheel Chocks".
Not legal advice. Verify the cited article against the signed agreement.