Don’t forget the chocks
When workers are loading or unloading a semi trailer, the Occupational Safety and Health Administration (OSHA) requires placing chocks, sand shoes, or some other method of blocking the wheels to prevent the trailer from moving. A dock lock could also be used because it provides equivalent protection.
These measures are required even when the trailer is parked on a downward-sloping dock. Gravity is not sufficient to hold the trailer in place. Most forklifts have enough power to pull a semi trailer, and could push the trailer away from the dock. Using chocks adds additional protection so that the trailer doesn’t move while a forklift is in the trailer.
In addition, employers might need to add jacks under the front of the trailer to prevent tipping, if the truck is not attached to the trailer. Jacks are required only when there’s a risk of upending a trailer. This risk is unlikely with longer trailers, but possible with shorter trailers.
Note that if the trailers are commercial motor vehicles (CMVs) used in interstate commerce, OSHA cannot enforce its chocking requirement. The Department of Transportation asserts jurisdiction over CMVs, according to an agreement between OSHA and the DOT.
However, in state-plan states, a state OSHA agency might be able to enforce a chocking requirement, since state rules aren’t automatically superseded by the DOT rules.
And if trailers are not used in interstate commerce, such as a yard horse, OSHA can enforce the wheel block provisions.