I don't think the 83 route will help you much either. I live in DC now but lived in Baltimore from 98-02 so I can tell you that depending on when it is, 83 can often be very slow and the Balto area traffic around 95 and the beltway (695 in Balto) is never that great and very unpredictable. I do agree that it's probably better than 301 though. If you do end up going through Balto, avoid the BW Parkway like the plague. There is always traffic or an accident and it can take forever just to get from Balto to DC (took our friend 3 hours to get to BWI on that road and she ended up missing her flight). I would definitely stick with 95 for that area. If you can plan it so you're not thee during any rush hours (good luck since they seem like 24 hours a day here) then hopefully it won't be too bad. Oh yeah, not sure when you'll be travelling or how many people you have, but I-66 is HOV only during rush hour. I can't remember if it's HOV-2 or HOV-3 since we try to stay away from highways during that time. Also not sure how far out of the city the HOV stuff extends, so maybe you'd be fine. Sorry I'm not more helpful, but I do think the Balto-DC area has the worst traffic in the world, and I am from northern NJ and am used to the NYC commuter traffic, but DC is 100x worse!