the number Route 27. Richmond Highway (Route 110) The extension of the Richmond Highway (which at the time was called Jefferson Davis Highway) ran along the east side of the Pentagon, parallel to the Rosslyn Connecting Railroad, connecting the junction of the Virginia State Route 110 (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. When the road was transferred to the Virginia Department of Highways on December 17, 1964, it was numbered Route 110. In 2019, Arlington County voted to rename U.S. Route 1 through Arlington County to Richmond Highway. Columbia Pike Extension (Route 244) Prior to the building of the Mixing Bowl, the Columbia Pike (and Route 244) ran through its site to end at the Jefferson Davis Highway (US 1). It was truncated at that time to Arlington Ridge Road, which itself was cut by the Mixing Bowl (and later cut by Arlington National Cemetery to the north). As part of that network, a connection was built from Arlington Ridge Road north of Columbia Pike east to the Arlington Memorial Bridge connection, continuing across that connection to the Pentagon south parking lot. It was also transferred to the Virginia Department of Highways on December 17, 1964, and numbered as an extension of Route 244. Pentagon access Access to the Pentagon was provided in the following places: South parking lot Shirley Highway east of the Mixing Bowl (full cloverleaf where Hayes Street now crosses, also providing access to Army Navy Drive to the south) Arlington Memorial Bridge connection (now Washington Boulevard) and the Columbia Pike Extension northeast of the Mixing Bowl (full cloverleaf) North parking lot Shirley Highway northeast of the Jefferson Davis Highway (partial cloverleaf with Boundary Channel Drive, providing full access) Arlington Memorial Bridge connection (now Washington