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.[1][2]
The signal is intended to convey a warning to other drivers of road hazards.
- ^ "B23a1 - Flash To Pass / Optical Horn Switch Circuit Stuck". AutoCodes.com. Retrieved 11 September 2020.
- ^ Barthelmess, W (21 May 1981). "Optical Horn - Aspects of a Trend". Zeitschrift für Verkehrssicherheit. 25 (4). ISSN 0044-3654. Retrieved 11 September 2020.