How far ahead should you signal before a lane change?

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Signaling before a lane change is about giving other drivers advance notice of your intended action so they can adjust their speed and position safely. The minimum distance you should signal is at least 100 feet ahead of the lane change. This gives drivers behind you enough time to see your signal, anticipate your move, and react—reducing the chance of a close call or collision.

Shorter distances, like 50 feet, leave too little time for others to respond, and signaling immediately before the change offers little warning. Waiting to signal only when other vehicles are present ignores the need to communicate your intention to all road users and is not a safe or responsible practice.