HAZMAT CDL Practice Test

Which signals may be used to warn of a stopped vehicle that contains explosives?

1. Warning flags

2. Reflective triangles

3. Flashing lights

4. Cones

The correct answer is: Reflective triangles

Reflective triangles are indeed used to warn of a stopped vehicle that contains explosives. The significance of these triangles lies in their visibility; they are designed to reflect light, making them particularly effective for alerting other drivers in low-light conditions or inclement weather. When placed appropriately, they create a clear warning that a hazard exists ahead, giving approaching drivers time to react safely, particularly critical when explosive materials are involved due to their potential danger. While warning flags, flashing lights, and cones may serve as warnings for various situations, they may not always be suitable for indicating the presence of a stopped vehicle carrying hazardous materials like explosives. For instance, flags may not be very noticeable at a distance, and while cones can create a physical barrier or alert, they do not have the same reflective properties as triangles. Flashing lights, although attention-grabbing, may not convey the specific type of danger associated with explosive cargo as clearly as reflective triangles do.