Even moving over slightly in the lane to avoid a pothole triggers it; it doesn't seem like a turn signal should be necessary in that situation. Instead the situation seems to be that I'm seeing the pothole and altering the car's course gently to avoid it, and I get close to the line and it freaks out.

I guess if I drove right up to the obstacle then swerved, it wouldn't do it...but I was always taught swerving was a last-resort thing, best to drive as smoothly as possible. (This was my dad's argument, and I said, "Uh, SOMEONE taught me to not swerve unless it was necessary..." (him). He laughed.