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The Occupational Safety and Health Administration (OSHA) and the Department of Transportation (DOT) regulate different aspects of wheel chocking requirements. OSHA regulates the use of wheel chocks during vehicle loading and unloading operations. OSHA covers chocking requirements under the Powered Industrial Truck Standard, Title 29 of the Code of Federal Regulations (29 CFR), Part 1910.178.
Trailer Chocks
The OSHA standard requires trucks and trailers to set their brakes and have wheels blocked to prevent movement of the vehicle.
Jack Supports
Semi-trailers not attached to a tractor must have front jacks in place, in addition to wheel chocks, to stabilize the vehicle.
Train Chocks
Railroad cars being loaded or unloaded must have their brakes locked and wheel stops (or other positive means of preventing movement) in place.
Exemptions
OSHA does not regulate wheel chocking for agricultural trailers, heavy haulers and pulpwood trailers. These vehicles are covered by DOT regulations.
Forklift Operations
OSHA requires that highway trucks have their brakes locked and rear wheels chocked when powered industrial trucks will board them.
Source:
OSHA: Chocking under the Powered Industrial Truck Standard
OSHA: Chocking During Forklift Dock Operations
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