If you have any doubts about how bad the roads are right now, check out this article in today's Seattle PI (especially the pictures)!
I was about 4 blocks from where this happened this afternoon. The road in front of our house has been closed because of ice. We watched cars slide up, down and sideways all day, so we're glad it's closed. It's crazy out there, and we have no intention of leaving the house for the next few days.