What should I do if I encounter heavy fog on the expressway?

When encountering heavy fog on the expressway, the following methods should be taken: 1. Strictly control the speed: the visibility is low in foggy days, the driving speed should be controlled within 40~60 kilometers, and the maximum speed should not exceed 80 kilometers per hour. When the visibility is extremely low in heavy fog, it is recommended to drive to the roadside safety zone or parking lot, and then move on after the fog clears or the visibility improves. 2. Correct use of lighting: Before driving in foggy days, it is necessary to comprehensively check the lighting devices of vehicles, including fog lights, taillights, width lights, low beam lights, etc., and make full use of lighting to improve visibility and see clearly the dynamics of vehicles and pedestrians. Need special reminder, don't use high beam when driving in foggy weather. This is because the light emitted by the high beam on the upper side of the optical axis will be diffused by the fog, which will form a vast expanse of whiteness in front of the car, and you can't see anything while driving. 3. Clean the line of sight: When encountering fog, the condensed water vapor on the windshield will damage the driver's line of sight, making the light emitted by the opposite car look particularly dazzling. Therefore, it is necessary to brush off the water vapor with a wiper frequently during driving to improve the clarity of sight. 4. Honk the horn frequently: If the line of sight is not good in foggy days, honking the horn frequently can serve as a warning to pedestrians and vehicles. When you hear the horns of other cars, you should whistle immediately to indicate the position of your car. 5. Don't overtake in foggy days: if you find that the vehicle in front is parked on the right, don't blindly bypass. Consider whether this car is letting the other car come.