Living in the Baltimore area and doing way more than my share of driving between DC and Baltimore I can say that more often than not, I end up in major traffic jams going into DC way more than coming home. Then again, I'm going in usually for a show so it's earlier.
After the show on Friday at Merriweather, I encountered almost no traffic at all coming back to Baltimore. It was a breeze!
Having done plenty of driving in the MD/DC/VA area, I'd have to say that they all suck equally when you are in it at the wrong time. It can be especially nerve racking when you aren't familiar with an area because you don't know their patterns and they aren't always consistant between states. However I have found that if there is a very large degree of traffic very late at night, it's more often than not somewhere in the DC area, specifically the Capital Beltway. I can only assume that Rt. 66 might get like that too.
For what it's worth, I'm totally blown away by how drastically Merriweather has changed. It's still a hike for me but one I've learned to take if I'm going to have a life that just isn't happening in Baltimore. Also, I don't care who plays at the Patriot Center, I'm NOT going!