Turning on hazard lights in a tunnel may be due to vehicle malfunction, low visibility, or towing a disabled vehicle. Hazard warning flashers, also known as "hazard lights," are designed to alert other vehicles and pedestrians that the vehicle is experiencing a special situation. They are a type of signal light on the vehicle. Here is information about the use of hazard warning flashers: According to the "Road Traffic Law": When driving at night without streetlights, under poor lighting conditions, or encountering low visibility due to fog, snow, rain, dust, hail, etc., vehicles must turn on headlights, position lights, and rear lights. When driving closely behind another vehicle in the same direction, high beams should not be used. Vehicles driving in foggy conditions must turn on fog lights and hazard warning flashers. When driving on highways under low visibility conditions such as fog, rain, snow, dust, or hail, with visibility less than 100 meters, vehicles must turn on fog lights, low beams, position lights, front and rear lights, and hazard warning flashers. The speed must not exceed 40 kilometers per hour, and a distance of at least 50 meters must be maintained from the vehicle ahead in the same lane. When driving on highways under low visibility conditions such as fog, rain, snow, dust, or hail, with visibility less than 50 meters, vehicles must turn on fog lights, low beams, position lights, front and rear lights, and hazard warning flashers. The speed must not exceed 20 kilometers per hour, and the vehicle must exit the highway at the nearest exit as soon as possible.
