What is the safe following distance at 100 km/h?

[Thompson]

When the speed exceeds 100 km/h, a distance of more than 100 meters should be maintained from the vehicle ahead in the same lane. When visibility is less than 200 meters: Turn on fog lights, low beam lights, position lights, and front and rear position lights. The speed should not exceed 60 km/h, and a distance of more than 100 meters should be maintained from the vehicle ahead in the same lane. When visibility is less than 100 meters: Turn on fog lights, low beam lights, position lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 40 km/h, and a distance of more than 50 meters should be maintained from the vehicle ahead in the same lane. When visibility is less than 50 meters: Turn on fog lights, low beam lights, position lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 20 km/h, and you should exit the highway as soon as possible from the nearest exit.