A turn signal should be used well in advance of a turn: Question A turn signal should be used well in advance of a turn: Answers So the driver does not forget to signal. So other drivers will not attempt to pass the turning vehicle. So other drivers may use the full lane. Explanation It is important to signal well in advance of a turn. This way, other drivers will be less likely to try to pass your vehicle in a manner that would impeded the safe completion of the turn.
