How to pay attention to safety when riding a bike in foggy weather?

When riding a bike in foggy days, you should control the speed according to the visibility, concentrate, and brake as early as possible when you find something ahead. Keep a large distance between cars when driving, and pay close attention to the surrounding vehicles and pedestrians. In foggy days, if the visibility is less than 5 meters, never take the express train, because the cyclist can't see clearly beyond 5 meters. If the speed is fast, once there is danger ahead, it will be too late to brake, causing an accident.