The two core functions of a vehicle's external lights are illumination and signal transmission. Low beams ensure close-range visibility while avoiding glare that interferes with oncoming vehicles, whereas high beams extend long-distance visibility and are suitable for unlit roads but require compliance with headlight switching rules when meeting other vehicles. The signaling function is achieved through turn signals, brake lights, etc. Turn signals clearly indicate the intention to change lanes or turn; brake lights warn following vehicles to maintain a safe distance when decelerating; and hazard warning lights (double flash lights) are used for comprehensive warning in emergency situations. In addition, fog lights enhance the vehicle's visibility in rainy or foggy weather through penetrating light sources, and license plate lights ensure that license plates are recognizable at night. All external lights need to be inspected and cleaned regularly. If malfunctions or abnormal water accumulation occur, they should be sent for repair promptly to ensure driving safety and compliance with regulations.
