 There's a much shorter work zone and a shorter delay southbound as you head south of Quantico and down towards 610. It takes away a single right lane, so there, stay to the center and to the left. That's about a mile's worth of slow traffic behind it that I can see. North on 395, leaving Springfield, you're okay up towards the Pentagon. There are work zones southbound, though, south of the Pentagon, where you have to stay down over to the right in order to get by safely down through Shirlington, and then a paving project south of Duke Street, where you have to shift back over to the left on the way down towards the Beltway.