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

The following measures should be taken when the expressway encounters fog: 1. The most important thing is to control the speed: traffic rules and speed limit must be strictly observed in foggy days: when the visibility is less than 200 meters and greater than 100 meters, the speed should not exceed 60 kilometers per hour; When the visibility is less than 100 meters and more than 50 meters, the speed shall not exceed 40 kilometers per hour; When the visibility is within 30 meters, the speed should be controlled below 20 kilometers per hour. 2. It is safe to use the lights reasonably: turn on the taillights and front fog lights. If you park in fog, the rear fog lights must not be turned on. At the same time, when parking in foggy days, you must turn on the double flash to warn the rear car. 3. Never slam the steering wheel: It is especially important to note that when driving in foggy weather, don't slam on or quickly release the accelerator, and don't slam the brakes or slam the steering wheel. If you really need to slow down, first slow down the accelerator, and then gently step on the brakes several times in a row, which can effectively prevent accidents such as rear-end collision. 4. Don't overtake when driving with the car: overtaking a moving vehicle is strictly prohibited in foggy days. When you find that the vehicle in front is driving on the right, don't blindly detour, but consider whether the vehicle is avoiding the oncoming vehicle. When overtaking a vehicle parked on the side of the road, after confirming that there is no intention to start and there is no car coming from the opposite side, sound the horn in time and bypass at a low speed from the left side. 5. When the visibility is too low, stop and wait for fog to disperse: when the visibility is less than 10 meter in foggy days, you should drive to the roadside safety zone or parking lot first, and then drive on the road after the visibility improves. If you must drive in foggy days, you should choose the speed at which you can stop quickly in foggy days (the sight distance must be greater than the braking distance). 6. Always look at the rearview mirror: Even if there is no fog at high speed, always look at the rearview mirror and observe the situation of the vehicles behind, just in case, don't drive too close to the car at ordinary times. 7. Slow down and drive into the rightmost lane: When "fog" is observed in front, you should immediately take deceleration measures to ensure that the vehicle stops smoothly and leave room. Before entering the "fog", if the distance and speed can meet the lane change conditions, turn on the signal light and slow down into the rightmost lane on the premise of ensuring safety. The purpose of doing this is to quickly enter the emergency lane to avoid collision in case of accidents and traffic jams ahead. 8. The road near the lake is the most prone to fog: old drivers who often travel by car often have this experience. It is easy to encounter strange "fog" when passing through the road near the lake in autumn and winter. 9. The fog on the sharp turn section is the most blocking sight: When driving on weekdays, the sharp turn section is originally an accident-prone area, even if it is only a thin fog, it actually contains this great danger. When driving in a foggy area with sharp turns, don't slam on the accelerator or loosen it, and don't suddenly brake and hit the steering wheel. 10. There are many dangers when driving on a long downhill road in foggy days: the long downhill road is often a road with frequent special weather conditions. In addition, many drivers are used to stepping on the brakes for a long time, which may lead to brake failure and brake sensitivity decline in foggy days; Therefore, when going downhill in foggy weather, don't just rely on the brakes to slow down, but also choose low gear to slow down; In addition, it is absolutely not allowed to slide in neutral or stall. When passing through a long downhill section in foggy days, you should strengthen observation, slow down to a suitable speed and pass smoothly, and don't brake suddenly if there is no situation.