Warning lines, used in warning line systems, shall be erected at least how far from the roof edge when no mechanical equipment is being used?

Warning lines, used in warning line systems, shall be erected at least how far from the roof edge when no mechanical equipment is being used?

• A. 6 feet
• B. 3 feet
• C. 9 feet
• D. 12 feet

Answer: (A)

Warning line systems create a buffer zone around the roof edge to keep workers from approaching the edge and to provide a safer working area. When no mechanical equipment is being used, the line must be placed at least six feet from the roof edge. This six‑foot margin gives workers time to recognize the boundary, move within a protected area, and reduces the chance of an accidental step or fall. A smaller distance would leave less room for safe movement, while larger distances aren’t required by the rule and can unnecessarily constrain work space.

Warning line systems create a buffer zone around the roof edge to keep workers from approaching the edge and to provide a safer working area. When no mechanical equipment is being used, the line must be placed at least six feet from the roof edge. This six‑foot margin gives workers time to recognize the boundary, move within a protected area, and reduces the chance of an accidental step or fall. A smaller distance would leave less room for safe movement, while larger distances aren’t required by the rule and can unnecessarily constrain work space.