The term "wheel chocks" and whether the employment of one chock would…

Filnamn: The term "wheel chocks" and whether the employment of one chock would satisfy the requirements of the Occupational Safety and Health Administration.

This is an OSHA interpretation letter responding to a query about the term "wheel chocks" in standard 29 CFR 1910.178(k)(l), clarifying that a single chock suffices if it effectively prevents truck movement, so no variance is needed. It also lists apparent hazards of the Kelley System regarding hydraulic leaks, wheel spotting, and color-blind misreading of indicator lights.