Following the September 11 attacks , SR 110 was closed to trucks and tour buses due to its proximity to the Pentagon . Police checkpoints were staffed around the clock to enforce this restriction . In September 2002 , a contract was awarded to reroute SR 110 to increase the standoff distance between vehicles and the Pentagon . The project , called the Pentagon Secure Bypass , was completed in 2004 . SR 110 was shifted eastward in a long arc to maintain a buffer distance from the Pentagon and a two-lane bridge to provide access to the Pentagon North parking lot and two pedestrian bridges were built over the new route . These and related security improvements cost $ 35 million ( equivalent to $ in ) and were completed in October 2004
September 11 attacks
September 11 attacks
Virginia State Route 110