headlight flash

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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  1. J

    General thought.

    I wonder if driverless cars will be programmed to recognise the 'after you mate headlights flash' . Omg here's another one ' will there then be a little hand pop up in the window to say thanks' from one driverless car to the other.
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