What is the safe distance on the highway with 200 meters visibility?

[Melody]

When visibility on the highway is below 200 meters, maintain a distance of more than 100 meters from the vehicle in front in the same lane. For both the driver and the driver ahead, maintaining a safe distance of more than 100 meters is more beneficial than harmful. Additionally, if visibility is less than 200 meters, the driver cannot clearly see the road conditions ahead. Therefore, it is essential and necessary to always keep a distance of more than 100 meters. When visibility is less than 200 meters, turn on fog lights, low beams, marker lights, and front and rear position lights, and do not exceed a speed of 60 kilometers per hour, maintaining a distance of more than 100 meters from the vehicle in front in the same lane. When visibility is less than 100 meters: turn on fog lights, low beams, marker lights, front and rear position lights, and hazard warning flashers, and do not exceed a speed of 40 kilometers per hour, maintaining a distance of more than 50 meters from the vehicle in front in the same lane. When visibility is less than 50 meters: turn on fog lights, low beams, marker lights, front and rear position lights, and hazard warning flashers, do not exceed a speed of 20 kilometers per hour, and exit the highway from the nearest exit as soon as possible.