What type of barriers should be used to prevent falls into a trench?

Using barricades, guardrails, or fencing is essential for preventing falls into a trench because these safety measures provide a physical barrier that clearly delineates the hazard area. They help to keep workers and bystanders at a safe distance from the edge of the trench, thereby reducing the risk of accidental falls.

Barricades are particularly effective because they can be easily seen and are designed to be sturdy enough to withstand the impact of a person or object inadvertently coming too close to the trench. Guardrails offer additional protection by providing a sturdy structure that individuals can hold onto, while fencing can restrict access to areas where there are hazards, ensuring that only authorized personnel are allowed near the trench.

In comparison to other options, which either do not provide a physical barrier (like warning signs) or are limited to single-material approaches (like wooden or concrete barriers), the comprehensive approach of using a combination of barricades, guardrails, or fencing ensures more effective risk mitigation. This holistic strategy is essential in construction and excavation sites where hazards are prevalent.