This is at the junction of Md. 384 (Colesville Road), Md. 390 (16th Street), North Portal Drive, N.W. (D.C. maintenance), 16th Street, N.W. (D.C. maintenance) and Eastern Avenue, N.W. (D.C. maintenance). It is
not a roundabout.
Washington Post: After years of planning, improvements to the 16th Street traffic circle still lagging (http://www.washingtonpost.com/local/after-years-of-planning-improvements-to-the-16th-street-traffic-circle-still-lag/2013/01/28/80ab2fd2-666e-11e2-85f5-a8a9228e55e7_story.html)
QuoteThe 16th Street traffic circle on the Silver Spring-District line can be a treacherous test of patience.
QuoteComing south on Colesville Road to the not-very-circular circle, drivers are supposed to yield to traffic heading north on 16th Street. But that's easier said than done because the roundabout's design does little to actually slow down that 16th Street traffic. And that can leave the southbound Colesville Road drivers waiting for what seems like forever for an opening.