Interstate 66 in the context of U.S. Route 66

Chantilly is a census-designated place (CDP) in western Fairfax County, Virginia, United States. The population was 24,301 as of the 2020 census.Located in the Northern Virginia portion of the Washington metropolitan area, Chantilly sits approximately 25 miles (40 km) west of Washington, D.C., via Interstate 66 and U.S. Route 50. It is located between Centreville to the south, Herndon and Reston to the north and northeast, respectively, and Fairfax 7 miles (11 km) to the southeast. U.S. Route 50 and Virginia State Route 28 intersect in Chantilly, and these highways provide access to the Dulles/Reston/Tysons Corner technology corridor and other major employment centers in Northern Virginia and Washington, D.C.

State Route 120 (SR 120) is a primary state highway in the U.S. state of Virginia. Known as Glebe Road, the state highway runs 9.10 miles (14.65 km) from U.S. Route 1 (US 1) in Crystal City north to SR 123 at the Chain Bridge. SR 120 is a partial circumferential highway in Arlington County that connects the southeastern and northwestern corners of the county with several urban villages along its crescent-shaped path, including Ballston. The state highway also connects all of the major highways in Virginia that radiate from Washington, including Interstate 395, I-66, US 50, and US 29. SR 120 is a part of the National Highway System for its entire length.

Ballston–MU station is a side-platformed Washington Metro station in the Ballston section of Arlington County, Virginia. The station opened on December 1, 1979, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). The station is part of the Orange and Silver Lines and serves the transit-oriented community of Ballston, Ballston Quarter, and Marymount University (MU).

Ballston–MU is also a central Metrobus transfer station. The station entrance is at North Fairfax Drive and North Stuart Street, near Wilson Boulevard and North Glebe Road. West of this station, the tracks rise above the ground inside the median of Interstate 66.

Vienna station, also known as Fairfax-GMU station, is a Washington Metro station in Fairfax County, Virginia. It is the western terminus of the Orange Line. The station is in the median of Interstate 66 at Nutley Street, also known as Virginia State Route 243, near Fairfax.

The station can be accessed from I-66 without merging onto Nutley Street by a series of ramps that transport commuters to the station's north and south side parking complexes. From the parking areas, riders use elevated walkways that bridge the east and westbound lanes of I-66 to reach the platform and mezzanine. The station provides easy access to the nearby Town of Vienna, the City of Fairfax, and the main campus of George Mason University. Service began on June 7, 1986.