WMATA announced this morning that the new S9 Metrobus route, offering express bus service along 16th Street, will launch on Monday, March 30. A ribbon cutting ceremony has also been scheduled for 10 a.m. that morning, at the stop at 16th Street and Columbia Rd. NW. The S9 route will be serviced by blue and silver hybrid-electric buses, which will be branded separately with “express” labels to differentiate them from the S1, S2 and…