What must be in place if a crane is used to lift materials over a sidewalk shed?

When a crane is used to lift materials over a sidewalk shed, having a flagger in place is crucial for ensuring safety. The flagger’s primary role is to control pedestrian and vehicular traffic in the vicinity of the lifting operation. They help to guide people and vehicles safely away from the area directly affected by the crane's operation, reducing the risk of accidents.

Having a flagger serves as a clear communication point and visual indication for anyone in the area, effectively alerting them to potential hazards associated with the lifting activities. The presence of a flagger is a common safety protocol in construction and heavy lifting operations where there is a risk of falling objects or other dangers to the public.

While safety nets, high visibility clothing, and security details may contribute to overall site safety, their roles do not directly address the immediate needs during crane operations over sidewalks. Safety nets are more effective in preventing falling materials from impacting the ground. High visibility clothing is important for worker safety but does not protect pedestrians. A security detail might assist in broader site security but does not focus directly on the immediate risks associated with crane operations.