snow causes car accidents

My best friend is in the driver's seat and I am in the passenger seat. We are driving through some really curvy roads in the mountains, thus it is a two-lane road with opposite traffic in one lane. 

All of a sudden, I realize that I'm in the driver's seat and our seats are both leaned back really far as if we're sleeping. I realize that my best friend is not maneuvering the car but I am.. with my feet!! By the time I realize this, we're on the left lane of the road heading opposite of traffic and a car is coming our way. I brake and the car goes around us but there are more cars coming towards us. Michelle and I somehow switch seats and before she even can get to the proper driving lane (on the right side), a car that was coming towards us swerves to their left and crashes against the mountains.

I yell at Michelle, "Watch out!" And we manage to not get hit, then another car comes and hits that other car that just crashed, we manage to also duck that one. But then a car comes directly right at us because they're skidding on the road and hits us gently. Then a big rig hits us really hard from the back. Upon impact, snow goes into our car. For a few seconds, I cannot breathe because I am buried in snow. I am thinking that maybe an avalanche is causing these accidents.

I manage to quickly get some of the snow out so that it's only up to my waist now. I look over and there's a chunk of snow that is wrapped around Michelle's neck. She's starting to choke so I take that chunk of snow and throw it out the window. Because the big rig had hit us so hard, it sent us flying down the road but the back of the car didn't look damaged from the inside. The big rig passes by us and it's a University of Cincinnati big rig. I say to Michelle that the big rig had brought the snow from Ohio all the way to California and that's why all that snow went in our car!

I look in the back of the car but there's only a little bit of snow left on the seats now. Michelle and I are also no longer covered in snow. We continue driving and I realize that all the other cars that were around us in the crash were also passing by us and continued on their merry way. I ask Michelle, "Isn't anyone going to stop??!! Shouldn't we call the cops or something?!" But she doesn't respond and we keep driving.