[mslif]

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I notice when you guys pass each other you do a little wave-of-recognition. What do you do when you pass a guy riding a moped?

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I don't wave at guys on moped, no special reason, I just don't.
Also, for example, when a car makes it easier for me to pass them, I'll stick my right leg out a little to say thanks. It is a common thing to do in Europe but I am not sure about it in the US.