Which signal is appropriate to warn of a stopped vehicle containing explosives?

Using reflective triangles is the appropriate choice to warn of a stopped vehicle containing explosives because these devices are specifically designed to alert other drivers to a hazard, especially in low visibility situations. They are highly visible and can be placed at a safe distance behind the stopped vehicle, effectively warning approaching traffic of the potential danger ahead.

Reflective triangles stand out because they are designed to reflect light, making them particularly effective during hours of darkness or in poor weather conditions. This is crucial when a vehicle is transporting hazardous materials, as the risks involved are significantly higher. It’s essential for ensuring that other drivers are adequately informed of the situation so that they can navigate safely around the stopped vehicle.

While other warning signals like flashing lights, warning cones, and flares do serve their purposes under different circumstances, reflective triangles are the standard for indicating a roadside hazard where explosives are involved, striking a balance between visibility and communication of risk. Flares can be hazardous themselves, especially near explosive materials, and the use of cones may not provide the same level of visibility as reflective triangles.