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TRAFFIC ALERT Metro's Blue/Orange/Silver Line are single tracking between Clarendon and Foggy Bottom due to a track problem.

Worst traffic merges in D.C. metro area

The WTOP Traffic Center used factors such as average volume, visibility, acceleration room, frequency of reported accidents and weaving to choose the 10 worst traffic merges in the Washington D.C. metro area. The majority of the merges were - not surprisingly - in the city, where space for interchanges is limited.