What 29 CFR 1926.1425 requires (plain English)
29 CFR 1926.1425 protects employees from being struck by crane loads. Its first requirement is a routing rule: where available, hoisting routes that minimize the exposure of employees to hoisted loads must be used, to the extent consistent with public safety. In other words, plan the lift path so loads do not travel over people.
The section then restricts who may be in the fall zone. While a load is rigged and being lifted, the employer must keep employees from being under the load and out of the fall zone (the area in which the load or rigging could fall). Only limited exceptions apply (for example, employees engaged in hooking, unhooking, or guiding a load, and those needed for the initial connection of a load to a component) and even then, only where the work cannot be done otherwise, with additional precautions.
The fall zone concept is central: it is not just directly beneath the load but the area the load or its parts could reach if something fails or the load swings. 1926.1425 works with the rigging requirements to reduce the chance a load falls and to ensure no one is in the way if it does. Struck-by-load is one of the leading crane fatality types, and keeping clear is its primary control.