you don't use that crap (left arm bent signaling right turn) when on a bike. You should point the way you wish to turn with the coresponding hand (ie. turn right, point with right hand. turn left point with left hand)
That bending elbow on left arm to signal right turn crap is only for cagers... They obviously can't stick there right hand out the passanger window to signal....
My general rule, if there is a car anywhere near you, signal. It is a common courtesy.
Mike
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"Ready to retire, just can't afford it yet!"