Which of the following is used to warn others of a stopped vehicle that contains explosives?

• A. Reflective triangles
• B. Traffic cones
• C. Emergency lights
• D. Flags

Answer: (A)

Reflective triangles are the standard way to warn other drivers about a stopped vehicle carrying hazardous materials. They’re designed to be highly visible in daylight and at night, and they can be placed along the roadway to create a clear warning zone that alerts approaching traffic early. This visibility is crucial when explosives are involved, helping drivers slow down and steer away in time. While emergency lights, cones, or flags can supplement warning, reflective triangles are the primary device used for signaling a stopped hazmat vehicle. Flags aren’t as visible, and lights alone may not provide the immediate, broad warning motorists need.