How is the swing radius danger zone established and communicated on site?

• A. Briefings alone are sufficient to communicate the danger; no barriers needed.
• B. Mark off with barriers or tape and signage; communicated to all personnel via briefings and signals; maintained as a no-entry zone during lifting.
• C. Use only signage; briefings are optional.
• D. No-entry zone is not required if the visibility is good.

Answer: (B)

The main idea is to control the area around the crane where the load and moving parts can reach. The swing radius is the danger zone formed by the crane’s rotation and the load’s possible movement; it can change quickly as the boom and load move, so you can’t rely on people simply staying away by sight. The best practice is to physically mark that zone with barriers or tape and put clear signage, then make sure everyone on site knows about it through pre-job briefings and standard signals. During a lift, the zone is maintained as a no-entry area, so only trained personnel directly involved in the lift stay inside under proper supervision. This combination of physical boundaries, clear reminders, and verified communication prevents accidental entry and reduces the risk of injury from unexpected swing or load movement. Relying on visibility alone, or on briefings or signage by themselves, does not provide adequate protection, and a no-entry rule is essential even when the weather or visibility seems fine.