Thanks, very informative. I've seen a lot of those used. We use the helmet pat on the Dragon for cops as well, sometimes followed by a show of fingers if there's more than one which is often the case in the summer months. I've seen as many as six sitting on that one 11 mile stretch of road!
I have a special hand signal for cars that are lane crossing... I use my left hand to sort of brush them to the side back into their lane. The middle finger also says "get out of my effing lane" pretty well.
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