Which control type is described as the least desirable and should be used only after engineering and administrative controls have been fully implemented?

• A. Engineering
• B. Administrative
• C. Travel Risk Planning System
• D. Physical: Personal Protective Equipment

Answer: (D)

Hazard controls are applied in a pyramid: eliminate or substitute the hazard first, then use engineering controls to remove or reduce exposure, followed by administrative controls that change how people work. Personal protective equipment sits at the bottom because it doesn’t remove the hazard itself; it relies on individuals to use it correctly, maintain it, and stay protected. That makes it the least desirable option, to be used only after engineering and administrative controls have been fully implemented. A planning system for travel risk is a planning tool, not one of the control types in the hierarchy.