Pentagon. That section included an interchange with Boundary Channel Drive, which served the Pentagon's north parking lot, and a bridge over the Rosslyn Connecting Railroad. US 1 was routed onto it, as the existing US 1 was cut in several places by ramps. After crossing the Jefferson Davis Highway, where US 1 exited to the south, the Shirley Highway turned west, with an interchange to access the south parking lot. (Hayes Street now crosses under the highway there.) Southwest of the Pentagon, the connection to the Arlington Memorial Bridge (now Route 27) merged, and soon after was a split for the connection to Lee Boulevard (now also Route 27, Washington Boulevard). Just past that, the original construction turned southeast to end at Arlington Ridge Road. The extension beyond to Route 7, also built by the federal government, opened October 23, 1943 and became a divided highway on October 30, 1944. The extension beyond Route 7 to US 1 near Occoquan was built by the Virginia Department of Highways as State Route 350 from 1945 to 1952. (SR 350 was also signed along the Federally built portion southwest of US 1.) On December 17, 1964, the road system was transferred to Virginia, and soon after the Shirley Highway became part of Interstate 95. With the cancellation of I-95 through Washington, D.C., it was renumbered to I-395 in 1977. Washington Boulevard (Route 27) What is now Route 27 was built in two sections. The western section served as a realignment of Washington Boulevard from Lee Boulevard (U.S. Route 50, now Arlington Boulevard) southeast to the Mixing Bowl. It had several grade crossings and one interchange (with Route 244, Columbia Pike). East of the Mixing Bowl, the other part of current Route 27 headed northeast, crossing a realigned Columbia Pike, with access to the Pentagon's south parking lot to the east. Past that was another full interchange, for Pentagon service access, just before a crossing (with no ramps) of the Jefferson Davis Highway Extension and the Rosslyn Connecting Railroad. Finally, an interchange with Boundary Channel Drive (for north parking) was provided, with access only to/from the north, before the road crossed the Boundary Channel into Washington, D.C. (on Columbia Island) for connections to the Mount Vernon Memorial Highway (now the G.W. Parkway) and Arlington Memorial Bridge. Those roads were also transferred to the Virginia Department of Highways on December 17, 1964 and assigned