You didn't mention what day of the week you are talking about. If it's any day except Friday you should be okay. If it's Friday, you'll have congestion on Rt. 95 south of Woodbridge even at 9:00 pm. Don't panic - it's normal and only lasts a short time. At that hour, when you get to the top of the Washington Beltway, I'd go to the east and take the beltway in the clockwise direction.