If conveyor belts are not visible, what must be on them to warn persons the belt will be starting?

• A. Audible warning devices
• B. Visual warning labels
• C. Stop switches
• D. Lights

Answer: (A)

When a hazard cannot be seen, you need an alert that can be heard even when the belt isn’t in view. Audible warning devices on conveyors provide a clear, immediate warning that the belt is about to start, giving workers time to move away and stay clear of moving parts. Visual warnings or labels aren’t as reliable in a noisy mine or when the belt isn’t visible, and a stop switch is meant for stopping the equipment, not signaling an imminent start. Lights can help, but audio alerts ensure notice regardless of visibility or lighting conditions.