Having just driven to BWI from Gaithersburg, I can say that the Arterials are OK, though some country roads have huge snowdrifts in one lane and are down to a single lane. But neighborhood streets are wrecked. Even in my relatively well plowed neighborhood the sleet berms are 3-5 feet high and higher in some points, and the lanes are one car width wide. Busses can't turn in that and it's not melting anytime soon.
I think we are shut down at MCPS til Monday. I just can't see any of these problems going away before then.