What signage should be placed around the perimeter of an excavation site?

The correct choice emphasizes the importance of safety signage that communicates potential hazards associated with the excavation site. Warning signs are essential for alerting personnel and the public to dangers such as open trenches, falling hazards, and other risks that may not be immediately apparent. These signs serve as a critical form of communication, helping to ensure that anyone in the vicinity understands the inherent dangers of the area and can take appropriate precautions.

Effective warning signage enhances safety by ensuring that all individuals, including workers and bystanders, are informed about potential risks. This proactive measure can prevent accidents and injuries, thereby supporting overall safety protocols on the site.

Other options, while they may have their own purposes, do not prioritize safety in the same way. Welcome signs, for example, can create an inviting atmosphere but do not convey important safety information. Similarly, providing information about the construction timeline or signage for nearby businesses may be relevant to project transparency or community relations, but they do not address the immediate safety risks posed by being near an excavation.