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!
This was filmed in Harbin, China, which was hit by its worst snow storm in 50 years on November 22. The driver wasn't injured but the car was seriously damaged.
Pilot Brian Gillespie crashed his car while driving at 300 km/h (186 mph) at El Mirage dry lake on Nov 10, 2013. He escaped with relatively minor injuries.