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When on the motorcycle I engage in the two most common hand signals.
The first is the wave, in which the initiator poses the question to a motorcyclist going the other way " Are you having as much fun as I am ? " and the responder signals " I sure am ".
The other is the hand touched to the helmet,
signifying " There's a cop ahead of you ".
While driving my car I regret not being able to tell my two wheeled brethren that there's speed enforcement ahead. So this roof mounted simulated cyclist (from the waist up) would deliver those two signals from the touch of a button inside the car.
A more intensive version that predates this less flexible application
[normzone, Mar 19 2015]
||There are a couple of other hand signals bikers use, but these are
almost exclusively reserved for drivers of vehicles with four or
more wheels, the small remainder being shared between pedal
cyclists and pedestrians ...
||Around here we just flash our high-beams to indicate speed traps, rock slides, or wildlife.
It would be nice to be able to specify.
||The signal hererabouts is left hand out, palm down, patting
downward. Four wheels and above flash lights. Both mean
slow down. Could mean cop ahead or other reason to slow
down. Hand touching head means your headlight is out.