And it's all basic physics, speed, traction, angular acceleration.
There was a 40 car pileup on I-81 in PA yesterday during a really heavy snow squall. Cars and trucks plowing into each other at what looks like 50MPH or so. Four or five killed and a bunch of vehicle fires.
There must be a spot where traffic backs up or stops just beyond that point. It seems like there is a small hill and the cars come over the hill and see the stopped cars ahead. The stupid drivers slam on their brakes and this is the result. Entertaining for sure, but not a good time for those involved - especially the innocent ones that are hit by the idiots.
I especially liked the idiot from 0:10 to 0:16. They had their foot stuck on the gas even after hitting the first car.