I was rear ended, HARD once. That distance gave me the space to control both my vehicle, and the one that hit me. It turned a potential multi car, multi lane pileup into a 2 vehicle wreck, either 1 more dinged car.
The space isn’t for the 99.999% of the time, but that 0.001% OH FUCK time.
I’ve dodged similar collisions a couple of times, over the years. Unfortunately, this time, she didn’t even touch the brakes. I was hit with a 50 mph differential, and no warning whatsoever.