Biggest Pile-Up Ever

Here is an image which involved a huge pile-up. Pile-Ups are a very common thing but how it got that back is out of my head. Its daylight, theres no fog, are the drivers blind? Everyone had to be bumper to bumper at amazing speeds for this to happen.

On coming cars, they had to see it all when they are 100 metres away, how can these guys go right into the pile up, its a clear and sunny day!!

Those guys who are still trying to go through or go around it arent going to get much luck either, its blocked on both sides. Good Luck to them.