We may have to travel from Calgary to Vancouver sometime around the end of October. I know there are chains laws at that time Our mh is a 42 ft. and we do not have snow tires nor are there any availab...
In my limited experience, it's mostly just after you were going up the hill, but didn't make it, and are now going back down backwards with even less control.
I feel safer when driving up a slippery hill than down a slippery hill.