Clifton - I got to the bottom of my driveway this morning and (wisely) bailed on the commute and drove the car instead. Everything was covered in ice!
With that said, if I felt that I had a safe way to get myself to the Sammamish Trail (the MUP that Clifton and I both ride), I would take that over the car in a heartbeat.
If it's just as bad tomorrow, I may drive to the park-n-ride near the trail and bike it from there.