I have always felt comfortable when I see another vehicle using their blinkers a few seconds before they change lanes. So when I'm passing vehicles, I start with putting my blinker on first and then reset my hands on the handle bars. Only after my blinkers have been on and I've checked other traffic again, that I shift lanes. This gives other drivers a few seconds of notice, plus my arms and hands are in proper position for any emergency during the lane shift. Road surface changes vary quite a bit when changing lanes, so I'm always prepared.
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