Which action should you take when braking?

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Communicating braking to drivers behind you helps prevent rear-end collisions. Glancing in your rearview mirror to confirm that the person behind you sees you slow down gives them a chance to react and avoid a crash. Horns aren't a reliable or consistent signal for others to reduce speed, and they can startle or confuse drivers. Accelerating briefly to create space goes against the purpose of slowing down and can increase risk. Ignoring your rearview mirror removes critical awareness of traffic behind you, which is unsafe. So, checking the rearview mirror as you brake is the best practice.