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BeaconTechnology.com Tip: You do not want heavy trucks or trailers loaded with heavy materials creeping or rolling away once they're parked. OSHA doesn't want that, either. OSHA requires the use of wheel chocks – wedge-shaped blocks that are placed in front of rear wheels to keep trailers from creeping while they're being loaded or unloaded. (As an added bonus, they guard against load shift.)
Wheel chocks are simple, smart, usually effective and with only one major drawback: Not all companies use them consistently, and their use is difficult to enforce. For safety's sake, all lift truck operators should verify that chocks are in place and the trailer is firmly against the dock before proceeding with their load, and be sure of the weight capacities you're dealing with. Other safety precautions at this point in the loading/unloading process include inspecting floorboards to be sure they'll withstand the weight of the load, lifting device, and all personnel, and making sure the load itself is secure and meets the capacity of the lifting equipment.
Some wheel chocks feature textured treadplates or saw-tooth bottoms to increase traction, and safety treads on the chock face for better grip. The chocks can be made of rubber, industrial rubber, steel or aluminum.