We drove down in June, took 81 to 77 to 26, and back we took 95 to Philly (staying in Horsham one night). I preferred 95 and we used the express lanes in DC, but DC to Baltimore was crazy busy. Yes, 81 will avoid DC completely, but I just don't know if I can put up with people that can't maintain their speed and constantly having to cancel cruise, slow down, wait for them to pass the trucks (going 60 in a 65 no less!), then resume speed just to have them speed up once they pass the trucks. Then do it all over again in 5 minutes. ARRRGG!