 Interloop of the Beltway, you lose the right lane in the long-term work zone at the Dulles Toll Road. They'll be out there all night as well. There's also a detour set up on the northbound George Washington Parkway. That seemingly never-ending project, well, they're going to block off all the northbound lanes overnight between Spout Run and 123. A posted detour is there. If you're coming up from the Key Bridge, just follow the signs and they'll get you out to the Beltway safely.