Getting from Bethesda to New Hampshire Ave. can be a nightmare on weekends, wouldn't even think about trying to do it during morning/evening rush hours - that part of the Beltway is full of sharp curves and hills that slow traffic to a crawl even in good weather - god forbid it be raining, cars wreck frequently. And Rockville is even worse - have to deal with I-270 traffic, which is a rolling roadblock every evening, after you've already sat in the Bethesda traffic on the Beltway (or vice-versa).