Affected by the smoggy weather, relatively serious traffic accidents occurred in Shanghai, Jiangsu, Zhejiang, Hebei and other places. Experts remind that when visibility is low, drivers must pay attention to controlling speed; especially in strong dense fog, it is best to stop driving and park the car close to the roadside; before setting out, fully check the vehicle's lighting devices, including fog lights, tail lights, clearance lights and low beams, and turn them on while driving according to visibility conditions; avoid dangerous road sections and honk frequently as a warning. If an accident occurs, try to park the car in a place that does not affect traffic, and personnel should quickly evacuate to a safe area.