What do brake lights indicate to other drivers?

Brake lights serve as a vital communication tool among drivers on the road, specifically indicating that a vehicle is slowing down or coming to a stop. When a driver applies the brakes, the brake lights illuminate, alerting those behind them to reduce their speed and prepare for potential changes in traffic flow. This signal helps to prevent rear-end collisions and enhances overall traffic safety.

In contrast, the other options do not accurately represent the purpose of brake lights. Changing lanes, for example, is typically indicated using turn signals, while information about traffic movement or safety to pass is conveyed through different means and messages.