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From VDOT:
Northern Virginia’s first Diverging Diamond Interchange (DDI) at Interstate 66 and Route 15 will open to traffic Saturday, Jan. 28, according to the Virginia Department of Transportation.
The new [$59 million] DDI alignment is scheduled to open at 9 a.m. Jan. 28. The interchange will be closed overnight for final lane striping the night before beginning at 8 p.m. Friday, Jan. 27. Detour information is available on the project page.
Traffic will shift onto the new bridge, with two out of the three lanes opening Saturday. Work will still continue on the multi-use path, overhead signs, and concrete islands until summer 2017, when the third lane will then open.
The DDI’s innovative design shifts vehicles to the opposite side of the road and eliminates left turns that cross oncoming traffic. Two-phase traffic signals at each end of the interchange reduce time spent at red lights and move twice the number of vehicles as a traditional diamond interchange. VDOT recently completed its first two DDIs in Louisa and Roanoke, and has two more in the works in Blacksburg and Stafford.
