When should you use hazard warning lights?

• A. When you are changing lanes.
• B. When your vehicle is disabled or you need to warn other drivers of a hazard.
• C. When you are driving in a speed zone under limit.
• D. When you're about to stop in a merge lane.

Answer: (B)

Hazard warning lights are for signaling that your vehicle isn’t moving normally or there’s a hazard ahead, so other drivers can take appropriate precautions. This is the best choice because it clearly communicates that you’re stopped or there’s a danger, helping others slow down and stay safe. Use them when your vehicle is disabled or you need to warn drivers about a hazard in your vicinity. They aren’t meant for routine driving actions like changing lanes or stopping in a merge lane, where turn signals are the proper way to show your intent. Turn them off once the hazard is resolved and you’re clear of traffic.