Which of the following might make unloading a Class 3 vehicle into a hopper unsafe?

• A. Unloading on rocky terrain
• B. Using a guide for hand signals
• C. Unloading when there are people within the radius of the raised box
• D. Lowering the box and getting into the box if you need to loosen items that are stuck

Answer: (C)

The main idea here is that there must be a clear safety boundary around the raised hopper. When the box is raised to unload, it can move, shift, or tilt suddenly, and material can spill or jolt the vehicle. If someone is within that radius, they’re at direct risk of being struck, crushed, or knocked over. Keeping people out of the danger zone around the raised box is the strongest safeguard against serious injury during unloading.

Using a guide for hand signals is a safety aid that helps coordinate movement and prevent miscommunication, so it supports safe unloading. Unloading on rocky terrain can create instability and tip hazards, but it can be mitigated with a stable, level surface and proper setup. Lowering the box and getting into the box to loosen items is dangerous and should never be done, but the scenario described here highlights the immediate risk to bystanders, which is why the presence of people within the radius makes unloading unsafe.