I watching this video with amazement and horror. That must have been very terrifying for anyone that was caught in this icy road. I have never had a car go out of control before, I have nothing to compare this video to, other than imagination.
My guess was that there was quite an incline to the road, hence the long long slipping of vehicles. My heart goes out to those people involved. I bet they got some salt on this particular stretch of road pretty quickly.
Thank you for taking us into a realm of vision where some of us haven't seen before. Great day. Cindi