To control the side and to identify the area of concern use _____, _____, _____, ______, and _____ to control crowds.

• A. Guards, Jersey barriers, caution tape, engineer tape, emergency vehicles
• B. Police line, signage, barriers only
• C. Guards, fences, tape, cones
• D. Security personnel, cameras, lights, police

Answer: (A)

Setting a controlled perimeter around a collapse site relies on a layered approach: visible personnel to deter and direct, sturdy physical barriers to establish a real boundary, clear boundary markers to identify the area of concern, and a visible, movable presence to reinforce the limit and provide rapid access for responders. Guards manage entry and crowd flow, Jersey barriers create a solid physical separation that can’t be easily bypassed, caution tape and engineer tape clearly delineate the danger zone, and emergency vehicles add both visibility and practical access control. Together, these elements produce a safe, managed scene with a clearly identified area of concern.

The other options fall short because they either rely on weaker or incomplete controls (signage alone, cones) or omit essential physical barriers and boundary markers, even if other protective tools like cameras or lights are present.