Interstate 66 (I-66) is an east–west Interstate Highway in the eastern United States. The highway runs from an interchange with I-81 near Middletown, Virginia, on its western end to an interchange with U.S. Route 29 (US 29) in Washington, D.C., at the eastern terminus. Much of the route parallels US 29 or State Route 55 (SR 55) in Virginia. I-66 has no physical or historical connection to the famous US 66, which was located in a different region of the United States.
Centreville is a census-designated place (CDP) in Fairfax County, Virginia, United States and a suburb of Washington, D.C. The population was 73,518 as of the 2020 census. Centreville is approximately 20 miles (32 km) west of Washington, D.C.
State Route 620 in Fairfax and Loudoun Counties, Virginia is a secondary state highway. The entire length of SR 620 is also known as Braddock Road. SR 620 also has a short concurrency with SR 659 / Union Mill Road in Centreville.
Virginia State Route 7 (VA 7) is a major primary state highway and busy commuter route in northern Virginia, United States. It travels southeast from downtown Winchester to SR 400 in downtown Alexandria. Its route largely parallels those of the Washington & Old Dominion Trail and the Potomac River. Between its western terminus and Interstate 395 (I-395), SR 7 is part of the National Highway System. In 1968, the Virginia State Highway Commission designated the road as the "Harry Flood Byrd Highway" between Alexandria and Winchester to commemorate Harry F. Byrd Sr. (1887–1966).
State Route 236 is a primary state highway in the U.S. state of Virginia. The state highway runs 15.63 miles (25.15 km) from U.S. Route 29 and US 50 in Fairfax east to SR 400 in Alexandria. SR 236 is a major suburban arterial highway that connects the independent cities of Fairfax and Alexandria via Annandale in Fairfax County. The state highway is known as Main Street in City of Fairfax, Little River Turnpike in Fairfax County, where the highway meets Interstate 495 (I-495), and Duke Street in Alexandria, where the road has junctions with I-395 and US 1.
The Fairfax County Parkway, numbered State Route 286, is a primary state highway in the U.S. state of Virginia, acting as an arterial route in Fairfax County with a mix of interchanges and signalized and unsignalized intersections. Its alignment runs from southeast to northwest and roughly corresponds to part of the once-proposed Outer Beltway around Washington, D.C. The first segment of the roadway opened in 1987; the road was completed in 2010.
State Route 123 is a primary state highway in the U.S. state of Virginia. The state highway runs 29.27 miles (47.11 km) from U.S. Route 1 in Woodbridge north to the Chain Bridge across the Potomac River into Washington from Arlington. It goes by four local names. From its southern terminus to the Occoquan River Bridge, it is known as Gordon Boulevard. From the Occoquan River Bridge to the city of Fairfax it is known as Ox Road. From Fairfax until it enters the Town of Vienna, it is known as Chain Bridge Road. Then, as it passes through the Town of Vienna, it is known as Maple Avenue. After leaving the Town of Vienna, the name reverts to Chain Bridge Road, and continues this way until the intersection with I-495 in Tysons. Between Tysons and the George Washington Memorial Parkway, it is known as Dolley Madison Boulevard. After crossing over the George Washington Memorial Parkway, the name once again reverts to Chain Bridge Road and continues this way until the end of the road, at Chain Bridge. SR 123 is a partial circumferential highway in Northern Virginia that connects Woodbridge in eastern Prince William County with the independent city of Fairfax and the Fairfax County communities of Vienna, Tysons, and McLean, the last being the home of the National Counterterrorism Center and the Central Intelligence Agency. The state highway also connects all of the major highways that radiate from Washington, including Interstate 95 (I-95), I-66, US 29, US 50, SR 267, and the George Washington Memorial Parkway. Furthermore, SR 123 crosses another pair of circumferential highways, I-495 and the Fairfax County Parkway, and SR 7, a major northwest–southeast highway through Northern Virginia. The state highway is a part of the National Highway System for its entire length.
U.S. Route 50 is a transcontinental highway which stretches from Ocean City, Maryland to West Sacramento, California. In the U.S. state of Virginia, US 50 extends 86 miles (138 km) from the border with Washington, D.C. at a Potomac River crossing at Rosslyn in Arlington County to the West Virginia state line near Gore in Frederick County.
U.S. Route 29 is a major north–south route in the Commonwealth of Virginia. It covers 248 miles (399 km) from the North Carolina border at the city of Danville to the Key Bridge in Washington, D.C. US 29 roughly bisects Virginia into eastern and western halves, and along with I-81 and US 11 in western Virginia, and I-85/95 as well as US 1 farther east, provides one of the major north–south routes through the Commonwealth.
State Route 228 is a primary state highway in the U.S. state of Virginia. The state highway runs 4.53 miles (7.29 km) from SR 657 at the southern town limit of Herndon north to SR 7 near Dranesville. SR 228 is the main north–south highway through Herndon, connecting the town directly with SR 7 and indirectly with SR 267 in northwestern Fairfax County.
Virginia State Route 234 is a primary state highway in the U.S. state of Virginia. It runs from U.S. Route 1 near Dumfries via Independent Hill as Dumfries Road, a bypass of Manassas as Prince William Parkway, has a brief concurrency with Interstate 66 for 2.27 miles (3.65 km) between exits 44 and 47, and Catharpin to U.S. Route 15 near Woolsey as Sudley Road.
State Route 645 in Fairfax County, Virginia is a secondary state highway. There are six portions, three of them being major, named Wall Road, Lees Corner Road, Stringfellow Road, Clifton Road, Main Street and Burke Lake Road. There are also numerous overlaps : some include SR 657 / Centreville Road, U.S. Route 50, SR 652, SR 612, and SR 641. A concurrency used to exist at US 29 near Centreville until the 1990s.
State Route 609 in Fairfax County, Virginia is a secondary state highway which traverses western portion of the county. The road is also known as Pleasant Valley Road.
The Loudoun County Parkway is a secondary state highway in eastern Loudoun County, Virginia. The southern portion is signed as State Route 606 from Braddock Road north to Old Ox Road, with the remainder signed as State Route 607.
State Route 608 in Fairfax County, Virginia is a secondary state highway which traverses the western portion of the county. Before the Fairfax County Parkway from US 29 to Reston was complete, SR 608 was the main north–south road in western Fairfax County.
State Route 606 in Fairfax and Loudoun Counties, Virginia is a secondary state highway traversing the communities of Reston, Herndon, Sterling, Arcola, and South Riding. The road is important not only because it is an inter-county connector, but it goes around the back of Dulles Airport, is part of the Loudoun County Parkway, and it provides a shortcut between the Reston / Herndon area and U.S. Route 50. Although the Herndon streets are not technically part of SR 606, they are signed as SR 606, and they connect to streets that are part of SR 606, thus providing a continuous route.
Wellington Road in Manassas forms part of a major connector between eastern Prince William County and Gainesville. The main connecting route between these two communities is the Prince William Parkway with Interstate 66; however, Wellington Road provides a well-traveled backup route.
State Route 662 is a secondary state highway in the U.S. state of Virginia, and traverses western Fairfax County.
State Route 657 in Fairfax County, Virginia is a secondary state highway which traverses the western portion of the county. It runs 8.4 miles from SR 28 near the boundary between Centreville and Chantilly to SR 228 at the town limits of Herndon.
State Route 605 in Fauquier and Prince William Counties, Virginia, United States is a 12.54 mi (20.18 km) secondary state highway from north of Warrenton near Bethel to southeast of Nokesville. From U.S. 15/U.S. 29 to its eastern terminus at VA 28, SR 605 serves as major artery serving traffic travelling between Warrenton and Nokesville, Manassas, and Dumfries. The entire route is two-lane and is located in rural or semi-rural areas, passing through farmland, woodland, and rural communities.
US 15 / US 29 / SR 657 near Remington 
SR 7 near Sterling
