Drivers should turn on fog lights under severe weather conditions with visibility below 200 meters, including fog, heavy rain, snow, sandstorms, or hailstorms, as well as on road sections without street lighting at night. Specific operations should be adjusted according to visibility: when visibility is 100 to 200 meters, fog lights, low-beam headlights, and position lights should be turned on simultaneously, with the vehicle speed not exceeding 60 km/h and a following distance of more than 100 meters maintained; when visibility is 50 to 100 meters, the vehicle speed should be reduced to below 40 km/h, and the following distance should not be less than 50 meters; if visibility is below 30 meters, fog lights should be turned on, the vehicle should pull over to the side of the road, and the hazard warning lights should be activated at the same time. Front fog lights are usually yellow, installed below the headlights, and enhance penetration by leveraging the fact that fog near the ground is thinner. The way to turn them on varies by vehicle model, with common designs being knob-type or button-type. Position lights are a prerequisite for turning on fog lights. Special care should be taken to avoid misusing fog lights when visibility is good, as their strong light may interfere with the vision of other drivers and is also a violation of regulations. Reasonable use of fog lights can significantly improve driving safety in low-visibility environments, but it needs to be combined with safety measures such as speed control and maintaining following distance.
