If an oncoming driver flashes his headlights at you during low visibility, what does it likely mean?

• Your high beams are ON, you should switch to low beams
  Explanation:

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  When an oncoming driver flashes their headlights at you during a period of low visibility, it is often a signal that your high beam headlights are on. High beams can be blinding to other drivers in such conditions, making it difficult for them to see the road.

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• You are driving too slowly, you should speed up
• Your turn signals are malfunctioning, you should check them
• You are driving in the wrong direction, make a U-turn as soon as possible