How far in advance should you generally signal before turning or changing lanes?

You should signal your intention well before turning or changing lanes so other drivers, cyclists, and pedestrians have time to anticipate your move. A common guideline is to signal at least about 100 feet before a turn in lower-speed areas, and farther in advance at higher speeds or on the highway. Signaling early — and turning the signal off after completing the maneuver — communicates clearly and reduces the chance of a collision. Always check mirrors and blind spots before moving, since signaling does not give you the right of way; it only states your intention.