hey... i am from the DC area and the previous poster does have a good point... while I wouldnt take a cab to the school from Silver Spring because that is pretty much DC, I would take a flat rate cab to BWI (the baltimore- washington international airport), then I would go to ground transportation and take a cab to the school... this will make your trip significantly cheaper.... or you can take the commuter train from Union Station to downtown Baltimore... you should look up the commuter train, I think that it is Amtrak, but don't quote me... just google it and it will tell you exactly what you need to know... the train actually goes to Camden Yards which is really close to the Dental School.... good luck!!!