What risk is associated with unsupported maximum timber scaffold planks that exceed recommended span lengths?

When timber scaffold planks exceed the recommended span lengths and are not properly supported, the primary risk is the potential for tripping. Unsupported planks can sag or flex under weight, leading to uneven surfaces that create hazards for workers. This can cause individuals to trip while traversing the scaffold, which can result in serious injuries.

Inadequate support on the planks compromises their structural integrity, making it difficult for workers to maintain their balance. Properly supported planks help ensure a stable and safe working environment, whereas overstressed or unsupported planks increase the likelihood of accidents. Ensuring that scaffold planks meet recommended lengths and are adequately supported is crucial for maintaining safety standards on construction sites.