Why must the swing path of cranes be barricaded?

• A. To prevent birds from nesting in the area.
• B. Riggers, oilers and other personnel can be crushed while the operator swings the crane.
• C. To reduce the crane's fuel consumption.
• D. To improve the operator's line of sight.

Answer: (B)

The main idea is protecting people from the crane’s moving reach. The swing path creates a hazardous zone where a moving boom or a swinging load can strike or crush anyone who enters. Barricading that area establishes a clear, physical boundary and a visible warning so riggers, oilers, and other workers stay out of the danger zone while the crane operates. This reduces the risk of serious injury that could occur if someone were in the arc or if objects in the area were struck by the crane. The other options don’t address this critical safety need—for example, barricades don’t serve to prevent birds, change fuel use, or reliably improve the operator’s line of sight.