State Route 644 is a secondary state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in southern Fairfax County, Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

. It is the closest main east–west road that is south of the Beltway. It is known primarily as Franconia Road east of I-95, and Old Keene Mill Rd west of I-95

Interstate 95 in Virginia

In the Commonwealth of Virginia, Interstate 95 runs through the state. It runs concurrently for with Interstate 64 in Richmond, and meets the northern terminus of Interstate 85 in Petersburg. Though Interstate 95 was originally planned to go straight through Washington, D.C., it was instead...

. Its intersection with I-95, which is right near the Springfield Mall

Springfield Mall (Virginia)

Springfield Mall is an enclosed shopping mall in Springfield, Virginia, located at the intersection of Interstate 95 and Franconia Road which is part of the Springfield Interchange. The mall is also located 1/4 mile north of Franconia-Springfield Parkway and the Franconia-Springfield metro station...

, was part of the major eight-year Springfield Interchange

Springfield Interchange

The Springfield Interchange, also known as the Mixing Bowl, is the interchange of Interstate 95, Interstate 395, and Interstate 495 in Springfield, Virginia, outside of Washington, D.C....

rebuilding project that was completed in July 2007.