...but I rarely see anyone complain about a related problem: drivers signaling
too late.
The whole point of using your turn signal when you change lanes is to let drivers in the other lane know you intend to move over. If you're already moving into the other lane by the time you start the signal, you might as well not have signaled at all.
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I wonder why they bother.
Though sometimes it can be helpful to not mislead one car that's not so far behind into attempting to wait for you, so then you instead ask the car behind them to wait for you, or something like that.