SR 110 is a part of the Pentagon road network , a network of freeways and surface roads built concurrent with the construction of the Pentagon in the early 1940s . The state highway received its numerical designation in 1964 when maintenance responsibility was transferred to the Virginia Department of Transportation . SR 110 's most significant changes in routing were relocation of the highway in Rosslyn to tie into I-66 in the 1980s and relocation of the freeway at the Pentagon to provide a larger security buffer for the building after the September 11 attacks . The highway is sometimes closed for large events held at or around the Pentagon , including the Marine Corps Marathon
September 11 attacks
September 11 attacks
Virginia State Route 110