What should be the speed limit when visibility is less than 30 meters in foggy conditions?
2 Answers
When visibility is less than 30 meters in foggy conditions, the speed should be controlled below 20 kilometers per hour. The following are relevant precautions for driving in foggy conditions: 1. Proper use of lights: When driving in fog, the fog lights should be turned on. If the fog is very heavy, the hazard lights should also be turned on to help other drivers observe each other better and avoid rear-end collisions and scratches. It should be noted that high beams should not be used in foggy conditions because the diffuse reflection can create a blinding white effect, making it harder to observe the road ahead. 2. Speed limit and distance control: When driving in foggy areas, depending on the visibility, turn on the anti-glare low beams, width markers, and tail lights, and appropriately increase the distance between vehicles while reducing speed. When visibility is below 50 meters, vehicles already on the highway must turn on fog lights, anti-glare low beams, width markers, and tail lights as required, and leave the foggy area safely at a speed not exceeding 20 kilometers per hour.
When driving in heavy fog with visibility reduced to less than 30 meters, I strictly maintain my speed around 15 km/h. This speed ensures I have enough reaction time—the braking distance typically requires about 10 meters, but if the fog is thick and the road is slippery, it may take even longer. Driving too fast increases the risk of losing control, such as failing to see a stationary car or obstacle ahead, leading to an instant rear-end collision. I always use low-beam headlights and fog lights, avoiding high beams, which can make the fog appear brighter and reduce visibility further. Additionally, I keep a distance of at least 30 meters from the car in front, slowing down further if the space feels insufficient. Remember, the safest approach to driving in fog isn’t about speed but patience. Once on the highway with poor visibility, I reduced my speed below 15 km/h and managed to avoid several accidents. If conditions are too dangerous, I simply pull over at a rest area and wait for the fog to clear—safety comes first.
