We just got back from driving down to WDW for a long weekend (from just north of Washington, D.C.) You want to time when you leave home so that you are not in Baltimore or Washington during their rush hours. If you left home after your local rush hour, you would certainly be past Washington before theirs began. As you come down Rt. 95 approaching Washington, go to the east on the Beltway and as long as you are onto Rt.95 south of Washington by 2:30 pm you should be okay. For us, Brunswick, GA is just about a 9 hour drive plus time for stops (650 miles in 9 hour you ask? Yep, the speed limit through most of the drive is 70 mph and the traffic goes at more like 75+). From Brunswick it’s 3 hours to WDW. BUT, if you’re going down for Spring Break, the dynamics change drastically. Then you’re big problem is not getting through Washington but it’s handling the heavy traffic all along the east coast because the highways will be jammed with people going somewhere. It gets really bad on I-4 as you approach WDW. This is why you are hearing people talking about driving through the night when they go down during Spring Break. It seems like everybody stays in Brunswick and leaves there at 7:00 or 8:00 am so the rush hour never ends on I-4 (and it continues late into the night). If I were ever to make the drive during Spring Break (which I will not do), I’d seriously consider getting into Orlando some way other than I-95/I-4; maybe one of the back roads down from Jacksonville).