NICET - Highway Construction Inspection Practice Exam

According to OSHA, what is the required height of a top rail on a guardrail above the walking surface?

1. 36"

2. 42"

3. 48"

4. 39"

The correct answer is: 42"

The required height of a top rail on a guardrail above the walking surface, as specified by OSHA, is 42 inches. This height is established to provide adequate protection for workers and to prevent falls from elevated surfaces. The regulation mandates that guardrails be installed to help ensure safety on construction sites, especially in areas with elevated walking surfaces. The choice of 42 inches strikes a balance between being high enough to prevent most individuals from inadvertently going over the rail while still being low enough to allow for visibility and ease of access. It also helps accommodate various worker heights and ensures compliance with safety standards aimed at preventing accidents. Other options reflect heights that do not meet the established safety standards set by OSHA, thus highlighting the importance of adhering to proper safety regulations in construction and maintenance activities.