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On narrow roads that are made up of sudden twists and blind hills, country drivers will flash their headlights — blink, blink, blink — to alert oncoming traffic to obstacles. They are letting others know there is a family of turkeys crossing the street or a truck stopped on a thin shoulder ahead.
It’s a red flag warning. The oncoming driver then chooses what to do with that warning, such as slowing down or putting on their hazard lights to alert people behind them.