How frequently do you count off your following distance? At highway speeds and in wintry weather, you need to leave yourself extra time (and distance) to react and slow down. Cars behind you may not be as cautious, and extra space ahead will reduce the chance of needing to slam your brakes. Since other drivers can be unsafe and unpredictable, it’s important to stay aware of your surroundings and maintain a cushion of safety as much as possible.
https://www.truckingtruth.com/cdl-training-program/page21/managing-space-around-your-vehicle