How could this bit of highway mayhem been avoided?

Updated Apr 28, 2016
Car crashes into truck

This truck driver was minding his own business when one car caused another to crash into his truck. The Nissan Sentra and the Honda Accord collide, causing the Honda Accord to collide with the truck in the next lane. In the video, the Nissan Sentra is seen driving up the lane after the accident. Who do you think was at fault for this accident?