What safety measure should be implemented at a roof edge to prevent falls?

The implementation of warning line systems at a roof edge is essential for preventing falls because these systems serve as a visible, physical barrier that alerts workers to the danger of falling. Warning lines are typically set up around the perimeter of a roof, providing a clear indication of where the edge is located and helping to keep workers at a safe distance from it.

While safety harnesses and personal fall arrest systems provide crucial protection during work at heights, they are reactive safety measures, meaning they only function after a fall has occurred. Guardrails also offer a robust form of preventive protection but may not be suitable or feasible for all situations, especially during the initial stages of roofing where the installation of permanent guardrails might not yet be completed.

By instituting a warning line system, it enhances situational awareness for workers, guiding them to maintain safe distances from the edge, thus significantly reducing the risk of falls during construction activities. This proactive approach emphasizes the importance of awareness and prevention in maintaining safety on rooftops.