What is the main purpose of brake lights?

The main purpose of brake lights is to alert other drivers that you are slowing down or coming to a stop. This safety feature is critical for preventing rear-end collisions, as it gives drivers behind you a clear signal that you are reducing your speed. When brake lights activate, they emit a bright red light that is easily recognizable, allowing other road users to react appropriately, either by slowing down or maintaining a safe distance.

While signaling lane changes, indicating presence on the road, and enhancing vehicle visibility are important aspects of driving, these functions are primarily served by other lights such as turn signals or headlights. Brake lights specifically convey the action of deceleration or stopping, making them essential for safe driving practices.