360 Training OSHA 30hr Practice Test 2026 - Free OSHA 30hr Practice Questions and Exam Study Guide

Guardrails are there to prevent falls by keeping anyone on the edge from stepping off. The standard height for a guardrail is set so that the top rail is high enough to stop accidental falls while you work near the edge. In many OSHA courses, the minimum is described as four feet (about 48 inches) for open-sided floors or platforms, which ensures the rail is well above the edge line and provides a reliable barrier on all open sides. While the exact OSHA specification uses a high-42-inch target (with a small tolerance), stating four feet in the question matches the safety intent and guarantees the rail is tall enough to protect workers.