Back a lot of years we had a really bad ice-storm. I was working for my uncle who is three miles away. I needed to get there so I drove my Farmall M with the tire chains on. On the way I found a guy with his van down in the ditch. Now the ice was 1/2" thick and just like a sheet of glass. Anyway the M spun some but pulled it up out of the ditch fairly easy. Only thing was the van still couldn't go on the ice.
Without chains we would have needed a winch and a tree to pull against. That was the worst ice-storm I've seen. The county eventually spread sand on all the roads.