A brake light is a safety feature on vehicles that illuminates when the driver applies the brakes. Its primary purpose is to alert other drivers that the vehicle is slowing down or stopping, helping to prevent rear-end collisions. Brake lights are typically red and are located at the rear of the vehicle, often integrated into the tail lights. Most modern vehicles have two brake lights, one on each side of the rear. In addition to standard brake lights, some vehicles may also have a third brake light, often mounted higher on the rear window or trunk. This additional light enhances visibility and further improves safety on the road.