Traffic on 95 in the Beltway area is ALWAYS a bitch. No matter what time of day it seems. Always allow for extra time Damo lol.
That's not quite true; I've driven the DC Beltway after 10 PM and it is usually free flowing. More seriously, the Beltway usually has certain spots where it is a pain (Virginia in general, between I-270 and Georgia Avenue, near the I-95 interchange on the Inner Loop) most of the time, and that sucks.
I've already advised Damo on the HFBoards forum to get Amtrak or buses for Devils games in Newark; he not only wants to avoid having the drive be one big headache, he also wants to have all his limbs after paying tolls in approximately a million locations.
BTW for Damo (and others), the MARC Penn Line started weekend service between DC and Baltimore back in December, so that is now a viable option for going to weekend afternoon Orioles games (though driving to Baltimore on weekends usually isn't too bad and the parking costs are also fairly reasonable if you don't mind walking a little bit). Additionally, Orioles games at OPACY are much more enjoyable than Nationals games at Nationals Park IMO.