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Other drivers may sometimes flash their headlights at you. In which situation are they allowed to do this?

A To warn you of their presence
If other drivers flash their headlights this isn’t a signal to show priority. The flashing of headlights has the same meaning as sounding the horn, it’s a warning of their presence.
B To warn of a radar speed trap ahead
C To show that they are giving way to you
D To let you know there is a fault with your vehicle