He's lucky, it could have been way worse...
He used for that a 4-minute video shot from the Washington Street bridge in San Diego and his After Effects skills. He says there's absolutely no CG elements, all the cars are real.
This is why you shouldn't let anything valuable inside your car.
Now, for the bright side: you don't have to pay for a broken window...
People really don't know how to drive on snow... nah, people just don't know how to drive!