I don't have chains. I have giant mud/snow tires and 4WD. So far, so good.
About that 60-70 car crash, evidently there was one original crash with a semi, as I understand it. But as the other drivers passed the accident and applied their brakes they slid out on ice, until there were just a lot of crashes all around, both directions. I saw pictures of some of the cars, they were pretty smashed up but apparently no fatalities. At least, that's what it said on the Medford news.