Brake lights are red lights located at the rear of a vehicle that illuminate when the driver presses the brake pedal. Their primary function is to signal to other drivers that the vehicle is slowing down or stopping, helping to prevent accidents. These lights are typically part of the vehicle's lighting system and are required by law in many places. When functioning properly, brake lights enhance road safety by providing clear visual cues to surrounding traffic, allowing drivers to react appropriately to changes in speed.