wig-wags
n.— «I’ve had folks tell me that the first thing they saw when I was approaching was the headlights wig-wag: way before my halogen light bar or sealed beam red/blue wig-wags.…Anyone can flash their headlights, but only emergency vehicles have wig-wags ;-).» —“Re: Still More Lights (and wig-wags!)” Usenet: misc.emerg-services Apr. 9, 1991. (source: Double-Tongued Dictionary)
Further reading
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