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Headlight flashing
Headlight flashing refers to 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. This signal is sometimes called an optical horn, since it draws the attention of other drivers.
The signal can be intended to convey a variety of messages, including a warning to other drivers of road hazards or of speed traps, and it can also be a form of aggressive driving. The legality of headlight flashing varies by jurisdiction.
==History==
Headlight flashing might have come into more common use as a means of attempting driver-to-driver communication by the mid-1970s, when cars began to come with headlight beam selectors located on the steering column—typically activated by pulling the turn signal stalk—rather than the previous foot-operated pushbutton switches. The signal stalk configuration was wired to permit the momentary activation of the high beams regardless of whether the headlamp switch was turned on or off.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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