Which safety feature on scaffolds helps to prevent falls from greater heights?

Guardrails are a crucial safety feature on scaffolds designed to prevent falls from greater heights. They are installed along the open sides and ends of platforms, creating a barrier that protects workers from accidental slips or falls. The height and design of guardrails meet specific safety regulations, which ensure they are effective in preventing falls.

When considering other safety features, toe boards serve to stop tools or materials from falling off the edge of the scaffolding, safety nets are effective in catching individuals if they happen to fall, and warning signs provide information about hazards but do not physically prevent falls. Guardrails, by providing a physical barrier, are directly aimed at preventing falls, making them the most essential safety feature in this context.