The extension of the Jefferson Davis Highway ran along the east side of the Pentagon , parallel to the Rosslyn Connecting Railroad , connecting the junction of the Jefferson Davis Highway ( U.S. Route 1 ) and Shirley Highway to Rosslyn . It had one interchange with the Pentagon , connecting to the drop-off area to the southeast . After crossing the Mixing Bowl-Arlington Memorial Bridge connection with no access , a partial interchange ( access to/from the south ) was provided with the main road to the bridge . The extension ended at Arlington Ridge Road just north of Lee Boulevard ( U.S. Route 50 ) . Following the September 11 attacks , Route 110 was closed to trucks and tour buses due to its proximity to the Pentagon . In September 2002 , a contract was awarded to reroute Route 110 to increase the standoff distance between vehicles and the Pentagon . The project , called the Pentagon Secure Bypass , was completed in 2004
September 11 attacks
September 11 attacks
Pentagon road network