The mega project of expanding the choked highways and adding a new Metro station to Tyson's Corner has begun. And things are going to get to get worse long before traffic gets better, if it ever does.
123 is losing lanes and 495 is sure to slow down here. Try to avoid both. Actually, try avoiding commuting anywhere in Northern Virginia until flying cars are invented.
Quote from VDOT:
The left lanes in each direction of Chain Bridge Road (Route 123) under the Capital Beltway will be closed until November as part of a project that will add four new high-occupancy toll (HOT) lanes to the Beltway.