Final answer:
The statement regarding safety protocols for dropping materials to a lower level, which includes posting signs and ceasing debris drop before removal, is true. This is essential to prevent accidents and ensure the safety of individuals below.
Step-by-step explanation:
The statement on safety protocols for dropping materials or debris to a lower level includes ensuring that signs are posted around the lower level and that removal should not start until the debris dropping has ceased is true. When dropping objects from a height, it's indeed crucial to ensure a safe distance from the edge is maintained and that there are no people or vehicles passing below that could be put at risk. Objects should not be dropped in a manner that would cause damage, and work areas should be clearly marked with signs to inform others of potential hazards. Equally important, debris dropping should have stopped before any cleaning or removal commences to prevent accidents.