What should you turn on if your headlights suddenly go out?

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When headlights fail, the priority is to stay visible to other drivers and signal that something is wrong. Emergency flashers do exactly that by flashing all the indicator lights, spreading attention to the front, sides, and rear of your vehicle. This helps others notice you even if your main headlights aren’t working. Turn signals are meant to show your intended direction, not to warn others about a breakdown. Fog lights won’t fix the issue and aren’t a reliable substitute for headlights, and high beams would blind or distract other drivers without addressing the failure. If you can do so safely, pull over and check the lighting or call for assistance after you’ve activated the hazard lights.