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5706.5.1.16 Tank Vehicle and Tank Car Stability
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When the vehicle is parked for loading or unloading, the cargo trailer portion of the tank vehicle shall be secured in a manner that will prevent unintentional movement.
Not less than two chock blocks not less than 5 inches by 5 inches by 12 inches (127 mm by 127 mm by 305 mm) in size and dished to fit the contour of the tires shall be used during transfer operations of tank vehicles.
Brakes shall be set and the wheels shall be blocked to prevent rolling.