Cordons are placed to distinguish work areas from public access areas.

	The Operational work zone is the perimeter around the area of operations. It is generally referred to as a physical barrier to mark the start of the warm zone.
	The hazard zone is a physical barrier designed to alert USAR operators of an area of severe hazard that can cause injury or harm to rescuers within the Operational work zone. For example, a fall hazard from a lift shaft, an overhanging hazard or a wall collapse zone. It is a designated NO GO zone for ALL staff, including USAR operators.