What is the standard following distance on highways?

[McKyle]

When driving on highways, if the vehicle speed exceeds 100 kilometers per hour, the distance from the vehicle in front in the same lane should be maintained at more than 100 meters; when the speed is below 100 kilometers per hour, the distance from the vehicle in front can be appropriately reduced, but the minimum distance should not be less than 50 meters. When driving on highways under low visibility weather conditions such as fog, rain, snow, dust, or hail, the following regulations should be observed: When visibility is less than 200 meters, turn on the fog lights, low beam lights, clearance lights, and front and rear position lights. The speed should not exceed 60 kilometers per hour, and the distance from the vehicle in front in the same lane should be maintained at more than 100 meters. When visibility is less than 100 meters, turn on the fog lights, low beam lights, clearance lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 40 kilometers per hour, and the distance from the vehicle in front in the same lane should be maintained at more than 50 meters. When visibility is less than 50 meters, turn on the fog lights, low beam lights, clearance lights, front and rear position lights, and hazard warning flashers. The speed should not exceed 20 kilometers per hour, and the vehicle should exit the highway at the nearest exit as soon as possible.