Source:
https://www.drivingtestsuccess.com/b...ation-distance
"Always know your limitations, and remember that: “Only a fool breaks the 2-second rule.”
Multiple collisions or pile-ups are caused by driving too close and too fast, which leads to drivers being unable to brake in time. You can avoid this by looking well forward, checking how the traffic is performing, getting clues from large vehicles, looking for buses pulling in and out, taxis stopping and turning, junctions and pedestrians."
And:
"Plus, if you hit the car in front of you, you are considered to blame. You have no choice as to the space left behind you, but you can control the amount of space in front".