headlight etiquette

Headlight flashing is the act of either briefly switching on the headlights of a car, or of momentarily switching between a headlight's high beams and low beams, in an effort to communicate with another driver or drivers. The signal is sometimes referred to in car manufacturers' manuals as an optical horn, since it draws the attention of other drivers.
The signal is intended to convey a warning to other drivers of road hazards.

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    Etiquette when flashing ?

    With the advent of LED lights (not just the MG4) and brighter dipped lights in general, what is a suitable etiquette when opposing drivers flash their main beams at you? For an example: the other night driving into town on dipped beams, the road being bumpy so the car was lurching up and down...
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