What is the Safe Following Distance in Foggy Weather?

[GrahamRose]

When driving in foggy weather, it is necessary to maintain a safe distance of 50-100 meters. When visibility is less than 200 meters: Turn on the fog lights, low beam lights, outline marker lights, and front and rear position lights. The speed should not exceed 60 kilometers per hour, and maintain a distance of more than 100 meters from the vehicle ahead in the same lane. When visibility is less than 100 meters: Turn on the fog lights, low beam lights, outline marker lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 40 kilometers per hour, and maintain a distance of more than 50 meters from the vehicle ahead in the same lane. When visibility is less than 50 meters: Turn on the fog lights, low beam lights, outline marker lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 20 kilometers per hour, and exit the highway as soon as possible from the nearest exit.