What protection from moving trips should be provided on both sides of permanent doors?

The correct answer is that shelter holes should be provided on both sides of permanent doors to protect against moving trips. Shelter holes serve as safe havens that allow individuals to step out of the way of moving equipment or materials, minimizing the risk of injury. This measure is crucial in maintaining safety in environments where heavy machinery is operated, as it provides an immediate escape route from potentially hazardous situations.

Barriers, while also useful, do not provide the same level of immediate safety as shelter holes since they may obstruct rather than facilitate safe positioning. Warning signs are important for communicating hazards, but they do not actively protect individuals. Reflective tape can enhance visibility, but it does not offer physical protection from the dangers posed by moving trips. Thus, shelter holes are specifically designed for safeguarding workers in close proximity to areas where equipment may be operating.