JH made a very excellent observation about what caused it, on Post#3.
Maybe they were friends of the (former) people in that SUV? I don’t know *why* they were filming at that exact time. The clip ends there; no follow-up which I can see, but I don’t use FB or those other sites, so I didn’t see any comments.
What a horrible thing to happen on a road trip. But that snowy/icy road looks very treacherous. And it was deadly.
That is why I do every thing I can not to have to drive in the snow and ice.