From Dulles District Supervisor Matthew Letourneau:

I also want to provide an update on this much needed intersection improvement. As you may have noticed, VDOT has installed interim flashing beacons to serve as an extra awareness tool to drivers that may not notice the signs at certain times of day (especially at night). Foundation design of the signal is still underway. There are some adjustments being made to account for rock and the water main proximity on one of the intersection’s corners. The next major milestone is advertisement for bidding on signal construction, which is expected to be posted November 15. I’m still hoping to have the signal fully operational by next summer if not sooner.