So let me say that as someone who lives right outside of D.C., its already fairly crazy. In fact, the crazy is almost over. All the metro stations around me, all those parking lots are completely full, and some of them are parking garages. Still full. With 10 mile backups behind them.
But that was all earlier around 4, 5, 6. Back when there was some rational hope that these places wouldn't be completly full. Now? You're better off walking.
Oh and its freezing out.