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

• A. 15 feet
• B. 50 feet
• C. 75 feet
• D. At least 100 feet

Answer: (D)

Signaling early gives others time to notice your intent and adjust, which helps prevent rear-end collisions. The guideline of signaling at least 100 feet before turning or changing lanes provides a clear, reliable warning to drivers behind you, allowing them to slow down or change lanes safely if needed. At typical city speeds this distance gives a practical heads-up without rushing the maneuver, and when you’re traveling faster you still benefit from initiating the signal well in advance. The other distances are too short to give enough warning in most driving situations. After completing the turn or lane change, keep your signal on just long enough to cover the movement, then cancel it.