Просмотр кода страницы Английская Википедия:Interstate 66

{{Английская Википедия/Панель перехода}}
{{Short description|Interstate in Virginia and DC}}{{Confuse|U.S. Route 66}}{{About|the current Interstate 66 in Virginia and the District of Columbia|the cancelled route from Kansas to Kentucky|Interstate 66 (Kansas–Kentucky)}}
{{Use mdy dates|date=May 2016}}
{{Use American English|date=March 2022}}
{{Infobox road
|country=USA
|type=I
|route=66
|map={{MapframeForObjects|frame=yes|plain=yes|frame-align=center|frame-width=295|frame-height=240|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Interstate 66}}}}
|map_custom=yes
|map_notes=I-66 highlighted in red
|length_mi=76.38
|length_ref=<ref name="FHWA log">{{cite web |publisher=[[Federal Highway Administration]] |work=Route Log and Finder List |url=http://www.fhwa.dot.gov/reports/routefinder/table1.htm |title=Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002 |url-status=live |archive-url=https://web.archive.org/web/20120908073425/http://www.fhwa.dot.gov/reports/routefinder/table1.htm |archive-date=September 8, 2012 |df=mdy-all }}</ref>
|established=1961
|restrictions=No trucks on Custis Memorial Parkway or Theodore Roosevelt Bridge
|direction_a=West
|terminus_a={{Jct|state=VA|I|81}} in [[Middletown, Virginia|Middletown, VA]]
|junction=
*{{Jct|state=VA|US|340|US|522}} in [[Front Royal, Virginia|Front Royal, VA]]
*{{Jct|state=VA|US|17|VA|55}} in [[Delaplane, Virginia|Delaplane, VA]]
*{{Jct|state=VA|US|15}} in [[Haymarket, Virginia|Haymarket, VA]]
*{{Jct|state=VA|VA|234}} near [[Manassas, Virginia|Manassas, VA]]
*{{Jct|state=VA|US|29}} in [[Centreville, Virginia|Centreville, VA]]
*{{Jct|state=VA|VA|28}} near [[Centreville, Virginia|Centreville, VA]]
*{{Jct|state=VA|VA|286}} near [[Fair Oaks, Fairfax County, Virginia|Fair Oaks, VA]]
*{{Jct|state=VA|US|50}} in [[Fair Oaks, Fairfax County, Virginia|Fair Oaks, VA]]
*{{Jct|state=VA|I|495}} in [[Dunn Loring, Virginia|Dunn Loring, VA]]
*{{Jct|state=VA|SR|267}} in [[Idylwood, Virginia|Idylwood, VA]]
*{{Jct|state=VA|GWMP}} in [[Arlington County, Virginia|Arlington, VA]]
|direction_b=East
|terminus_b={{Jct|state=DC|US|29}} in [[Washington, D.C.]]
|counties='''VA:''' [[Frederick County, Virginia|Frederick]], [[Warren County, Virginia|Warren]], [[Fauquier County, Virginia|Fauquier]], [[Prince William County, Virginia|Prince William]], [[Fairfax County, Virginia|Fairfax]], [[Arlington County, Virginia|Arlington]]<br />'''DC:''' [[Washington, D.C.|City of Washington]]
|states=[[Virginia]], [[District of Columbia]]
|system1={{infobox road/browselinks/USA|state=VA}}
|system2={{infobox road/browselinks/USA|state=DC}}
|browse={{va browse|previous_type=VA|previous_route=65|route=VA|next_type=VA|next_route=67}}
{{dc browse|previous_type=US|previous_route=50|route=DC|next_type=I|next_route=95}}
}}
'''Interstate&nbsp;66''' ('''I-66''') is a 76.32 mile east–west [[Interstate Highway]] in the [[East Coast of the United States|eastern United States]]. The highway runs from an interchange with [[Interstate 81 in Virginia|I-81]] near [[Middletown, Virginia]], on its western end to an interchange with [[U.S. Route 29 in the District of Columbia|U.S. Route&nbsp;29]] (US&nbsp;29) in [[Washington, D.C.]], at the eastern terminus. Much of the route parallels [[U.S. Route 29 in Virginia|US&nbsp;29]] or [[Virginia State Route 55|State Route&nbsp;55]] (SR&nbsp;55) in [[Virginia]]. I-66 has no physical or historical connection to  [[U.S. Route 66|US&nbsp;66]], which was located in a different region of the United States.

The '''E Street Expressway''' is a spur from I-66 into the [[Foggy Bottom]] neighborhood of Washington, D.C.

== Route description ==
{{lengths table}}
|-
|[[Virginia|VA]]
|74.8
|120.54
|-
|[[Washington, D.C.|DC]]
|1.6
|2.57
|-
|Total
|76.4
|123.11
|}

=== Virginia ===
==== Interstate 81 to Dunn Loring ====
[[File:2018-10-12 11 58 26 View west along Interstate 66 at Exit 1 (Interstate 81, Roanoke, Winchester) in northwestern Warren County, Virginia.jpg|thumb|Western terminus of I-66 at the interchange with [[Interstate 81 in Virginia|I-81]] in [[Middletown, Virginia]]]]
[[File:2018-10-23 12 24 56 View west along Interstate 66 and the Orange Line of the Washington Metro from the overpass for Virginia State Route 243 (Nutley Street) in Oakton, Fairfax County, Virginia.jpg|thumb|I-66 in [[Oakton, Virginia|Oakton]], with a [[Washington Metro]] train using the tracks in the median]]
I-66 begins at a [[directional T interchange]] with [[Interstate 81 in Virginia|I-81]] near [[Middletown, Virginia]]. It heads east as a four-lane freeway and meets [[U.S. Route 522|US&nbsp;522]]/[[U.S. Route 340|US&nbsp;340]] at a [[partial cloverleaf interchange]]. The two routes head south to [[Front Royal, Virginia|Front Royal]] and north to [[Lake Frederick, Virginia|Lake Frederick]]. I-66 continues east, paralleling [[Virginia State Route 55|SR&nbsp;55]] (John Marshall Highway) and meeting [[U.S. Route 17 in Virginia|US&nbsp;17]] at a partial interchange with no access from southbound US&nbsp;17 to westbound I-66. SR&nbsp;55 also merges onto the freeway at this interchange, forming a three-way [[Concurrency (road)|concurrency]] that ends near [[Marshall, Virginia|Marshall]], with SR&nbsp;55 leaving with [[U.S. Route 17 Business (Marshall, Virginia)|U.S. Route&nbsp;17 Business]] (US&nbsp;17 Bus.) and US&nbsp;17 leaving at the next exit.

Expanding to six lanes and continuing to parallel SR&nbsp;55, I-66 enters the towns of [[Haymarket, Virginia|Haymarket]] and [[Gainesville, Virginia|Gainesville]], reaching interchanges with [[U.S. Route 15 in Virginia|US&nbsp;15]] (James Madison Highway) and [[U.S. Route 29 in Virginia|US&nbsp;29]] (Lee Highway) in each town, respectively. The highway then heads to the south of the [[Manassas National Battlefield Park]] and to the north of the [[Bull Run Regional Park]]. The highway reaches another interchange with US&nbsp;29 and passes to the north of [[Centreville, Virginia|Centreville]] and meets [[Virginia State Route 28|SR&nbsp;28]] (Sully Road) at an interchange with cloverleaf and stack elements to it. SR&nbsp;28 heads north to [[Dulles International Airport]] and south to [[Manassas, Virginia|Manassas]].

The freeway then meets [[Virginia State Route 286|SR&nbsp;286]] ([[Fairfax County Parkway]]), [[U.S. Route 50 in Virginia|US&nbsp;50]] (Lee Jackson Memorial Highway), and [[Virginia State Route 123|SR&nbsp;123]] ([[Chain Bridge (Potomac River)|Chain Bridge]] Road) at a series of interchanges providing access to D.C. suburbs. The [[Orange Line (Washington Metro)|Orange Line]] and [[Silver Line (Washington Metro)|Silver Line]] of the [[Washington Metro]] begin to operate in the median here, as the highway reaches a large interchange with the [[Interstate 495 (Washington, D.C.)|I-495]] ([[Capital Beltway]]).

I-66 has a tolled [[high-occupancy vehicle lane|HOV lane]] from US&nbsp;15 to the Capital Beltway.

==== Dunn Loring to Theodore Roosevelt Bridge ====
The section of I-66 in Virginia east of the Capital Beltway is named the '''Custis Memorial Parkway''',<ref>{{cite web |date=July 14, 2009 |title=Arlington Virginia List of State Roads |url=http://www.arlingtonva.us/Departments/EnvironmentalServices/cpe/row/EnvironmentalServicesState.aspx |url-status=dead |archive-url=https://web.archive.org/web/20060304024247/http://www.arlingtonva.us/Departments/EnvironmentalServices/cpe/row/EnvironmentalServicesState.aspx |archive-date=March 4, 2006 |access-date=2010-08-23 |work=Department of Environmental Services |publisher=[[Arlington County, Virginia#Local government|Government of Arlington County, Virginia]] |quote=I-66 Custis Memorial Parkway}}</ref><ref>{{cite web |title=State Roads |url=https://transportation.arlingtonva.us/streets/state-roads/ |url-status=dead |archive-url=https://web.archive.org/web/20140412013229/https://transportation.arlingtonva.us/streets/state-roads/ |archive-date=April 12, 2014 |access-date=December 27, 2020 |work=Transportation |publisher=[[Arlington County, Virginia#Local government|Government of Arlington County, Virginia]] |quote=Interstate 66: Custis Memorial Parkway}}</ref><ref>{{cite web |title=I-66 |url=http://www.vahighways.com/route-log/i066.htm |url-status=live |archive-url=https://web.archive.org/web/20150613235648/http://www.vahighways.com/route-log/i066.htm |archive-date=June 13, 2015 |access-date=December 27, 2020 |work=vahighways.com: The Virginia Highways Project |quote='''Legislative names:''' Custis Memorial Parkway, I-495 to DC (since 1-21-82)}}</ref><ref>{{cite news|last=Levey|first=Bob|date=November 5, 1981|title=An Honor That Nellie Custis Doesn't Deserve|url=https://www.washingtonpost.com/archive/local/1981/11/05/an-honor-that-nellie-custis-doesnt-deserve/18ed80c2-ee1a-4f68-a5e5-4cae70a71485/|access-date=December 27, 2020|newspaper=[[The Washington Post]]|quote="Ain't no sense in trying to turn it around," said D. D. Harris, an engineer for the Virginia Highway Department. "Arlington County and Fairfax County agreed a year ago to call it the Custis Memorial Parkway. We've even ordered the signs for the entrances.<br />"The only thing that hasn't been done is for final approval to be granted. But that's just dotting I's and crossing T's. It's settled. This is no time to be drumming up business."}}</ref> a [[toll road]] with variable tolls during peak hours.<ref>{{Cite web|title=66 Express Lanes - Inside the Beltway :: About the Lanes|url=http://66expresslanes.org/about_the_lanes/default.asp|access-date=2021-01-09|website=66expresslanes.org}}</ref> The road narrows to four lanes as it heads through [[Arlington County, Virginia|Arlington County]]. The parkway meets [[Virginia State Route 7|SR&nbsp;7]] (Leesburg Pike) at a full interchange. [[Virginia State Route 267|SR&nbsp;267]] (Dulles Toll Road) meets the parkway with an eastbound entrance and westbound exit. Continuing through neighborhoods, the route yet again meets US&nbsp;29 at an incomplete interchange and continues east into Arlington County, meeting [[Virginia State Route 120|SR&nbsp;120]] (Glebe Road) and continuing to Arlington County. It meets [[Spout Run Parkway]] and enters [[Rosslyn, Virginia|Rosslyn]]. The freeway turns southeast and runs in between US&nbsp;29 as it approaches the [[Theodore Roosevelt Bridge]], reaching another eastbound entrance and westbound exit as US&nbsp;29 continues north on the [[Key Bridge (Washington, D.C.)|Key Bridge]]. It then has a complex interchange with [[George Washington Memorial Parkway|George Washington Parkway]] and [[Virginia State Route 110|SR&nbsp;110]] (Richmond Highway), providing access to [[Alexandria, Virginia|Alexandria]] and [[the Pentagon]], respectively. US&nbsp;50 ([[Arlington Boulevard]]) merges onto the highway with a westbound exit and eastbound entrance and the two traverse the bridge.

The "Custis Memorial Parkway" name commemorates the Custis family, several of whose members (including [[Martha Dandridge Custis Washington]], [[George Washington Parke Custis]], [[Eleanor "Nelly" Parke Custis Lewis]] and [[Mary Anna Randolph Custis Lee]]) played prominent roles in [[Northern Virginia]]'s history. Because of its terminus in the [[Shenandoah Valley]], some early planning documents refer to I-66 as the "Shenandoah Freeway", although the name did not enter common use.<ref>{{cite web|title=Department of Planning & Zoning – Planning Zoning|url=http://www.fairfaxcounty.gov/dpz/comprehensiveplan/planhistoric/1984_documents/1984_transportation.pdf|url-status=live|archive-url=https://web.archive.org/web/20170208064206/http://www.fairfaxcounty.gov/dpz/comprehensiveplan/planhistoric/1984_documents/1984_transportation.pdf|archive-date=February 8, 2017|access-date=May 3, 2018|website=www.fairfaxcounty.gov|df=mdy-all}}</ref>

Between the Capital Beltway and the Theodore Roosevelt Bridge, the eastbound (inbound) roadway is a [[high-occupancy toll]] (HOT) road from 5:30 to 9:30&nbsp;am, and the westbound (outbound) roadway is an HOT road from 3:00 to 7:00&nbsp;pm. [[E-ZPass]] is required for all vehicles except motorcycles, including Dulles Airport users. I-66 is free during those times for HOV-3+ drivers with an E-ZPass Flex and for motorcycles. Other drivers must pay a toll that can be almost $50 at peak times. Outside of these hours, I-66 is free for all drivers to use.<ref name="express-lanes">{{Cite web|title=66 Express Lanes - Inside the Beltway :: Using the Lanes|url=http://66expresslanes.org/using_the_lanes/default.asp|access-date=2019-09-02|website=66expresslanes.org}}</ref>

=== Washington, D.C. ===
In [[Washington, D.C.]], the route quickly turns north, separating from US&nbsp;50. The highway interchanges with the E Street Expressway spur before passing beneath [[Virginia Avenue]] in a short tunnel. After an indirect interchange with the [[Rock Creek and Potomac Parkway]] (via 27th Street), the highway terminates at a pair of ramps leading to the Whitehurst Freeway (US&nbsp;29) and L Street. The portion of Interstate 66 within Washington, DC, is known as the Potomac River Freeway.

==== E Street Expressway ====
{{Infobox road small
|state=DC
|name=E Street Expressway
|location=[[Washington, D.C.]]
|length_mi=0.3
|length_ref=<ref name=estreet-googlemaps>{{google maps |url=https://goo.gl/maps/1bjH5HykD8ueMZVv7 |title=E Street Expressway |access-date=January 31, 2020}}</ref>
|formed=
|deleted=
|historic=
|yr_ref=
}}
[[File:2016-10-02 07 18 48 View east along the E Street Expressway between Interstate 66 (Potomac River Freeway) and 23rd Street NW in Washington, D.C..jpg|thumb|The E Street Expressway just east of I-66]]
The '''E Street Expressway''' is a spur of I-66 that begins at an interchange with the Interstate just north of the Roosevelt Bridge. It proceeds east, has an interchange with Virginia Avenue Northwest, and terminates at 20th Street Northwest. From there, traffic continues along E Street Northwest to 17th Street Northwest near the [[White House]], the [[Old Executive Office Building]], [[George Washington University]], and the [[Corcoran Gallery of Art]]. Westbound traffic from 17th Street takes a one-block segment of [[New York Avenue (Washington, D.C.)|New York Avenue]] to the expressway entrance at 20th and E streets northwest. The expressway and the connecting portions of E Street and New York Avenue are part of the [[National Highway System (United States)|National Highway System]].

In 1963, the construction of the E Street Expressway caused the demolition of multiple buildings of the [[Old Naval Observatory]].<ref name=":0">{{Cite web|last1=Harden|first1=Victoria A.|last2=Lyons|first2=Michele|date=2018-02-27|title=NIH's Early Homes|url=https://irp.nih.gov/catalyst/v26i2/nih-s-early-homes|access-date=2020-09-28|website=The NIH Catalyst|language=en}}</ref>

;Exit list
The entire route is in the [[Foggy Bottom]] neighborhood of [[Washington, D.C.]] All exits are unnumbered.{{jcttop|nocty=yes|location=none|hatnote=off|length_ref=<ref name=estreet-googlemaps/>}}
{{DCint
|mile=0.00
|road={{jct|state=DC|I|66|US|29|to2=yes|dir2=south|name2=[[Whitehurst Freeway]]|location1=[[Northern Virginia|Virginia]]}}
|notes=Western terminus
}}
{{DCint
|mile=0.1
|type=incomplete
|road=[[Virginia Avenue]]&nbsp;/ 23rd Street
|notes=Eastbound exit only
}}
{{jctbridge
|mile=0.1
|mile2=0.3
|bridge=Tunnel underneath [[Virginia Avenue]]
}}
{{DCint
|mile=0.3
|road=20th Street&nbsp;/ E Street east
|notes=Eastern terminus; [[at-grade intersection]]
}}
{{jctbtm|keys=incomplete}}

== History ==
=== Virginia ===
[[File:Interstate 66.jpg|thumb|I-66 in [[Fairfax County, Virginia|Fairfax County]] with the [[Orange Line (Washington Metro)|Metrorail Orange Line]] in the median. The left lane is an [[High-occupancy vehicle lane|HOV lane]], and the right shoulder is used as a travel lane during rush hour; both lanes were widened as part of the Transform 66 project.]]
[[File:2018-10-25 13 28 25 View east along Interstate 66 (Custis Memorial Parkway) from the overpass for North Scott Street in Arlington County, Virginia.jpg|thumb|I-66 at Scott Street in [[Arlington County, Virginia|Arlington County]]]]
[[File:I-66 and US 50 Arlington.jpg|thumb|I-66 westbound in [[Rosslyn, Virginia|Rosslyn]]]]
I-66 was first proposed in 1956 shortly after [[United States Congress|Congress]] established the Highway Trust Fund as a highway to connect [[Strasburg, Virginia]], in the Shenandoah Valley with Washington, D.C..<ref name="Lynton">{{cite news |last1=Lynton |first1=Stephen |title=A Long Road Bitter Fight Against I-66 Now History |url=https://www.washingtonpost.com/archive/local/1982/12/22/a-long-road-bitter-fight-against-i-66-now-history/57a54c65-79ee-40fd-ab6f-ac34a624414d/ |access-date=11 October 2018 |newspaper=The Washington Post |date=22 December 1982}}</ref><ref>{{cite news |last1=Guinn |first1=Muriel |title=Approach to Airport Urged for Highway 66 |newspaper=The Washington Post |date=18 June 1958}}</ref>

During the planning stages, the Virginia Highway Department considered four possible locations for the highway inside the Beltway; in 1959, it settled on one that followed the Fairfax Drive–Bluemont Drive corridor between the Beltway and [[Virginia State Route 120|SR&nbsp;120]] (Glebe Road); and then the Washington and Old Dominion (W&OD) corridor between Glebe Road and [[Rosslyn, Virginia|Rosslyn]] in [[Arlington County, Virginia|Arlington County]]. The route west of 123 was determined earlier. Two other routes through Arlington neighborhoods and one along Arlington Boulevard were rejected due to cost or opposition.<ref>{{cite news |last1=Lawson |first1=Jack |title=Arlington Corridor Chosen For Interstate Highway 66 |newspaper=The Washington Post |date=20 February 1959}}</ref> I-66 was originally to connect to the [[Three Sisters Bridge]], but, as that bridge was canceled, it was later designed to connect to the [[Potomac River Freeway]] via the Theodore Roosevelt Bridge.<ref>{{cite news |last1=Ladner |first1=George |title=Committee Will Await Public Reaction Before Deciding on Site for Bridge |newspaper=The Washington Post |date=19 September 1964}}</ref>

On December&nbsp;16, 1961, the first piece of I-66, an {{Convert|8.6|mi|km|-long|adj=mid}} section from US&nbsp;29 at [[Gainesville, Virginia|Gainesville]] to [[U.S. Route 29 in Virginia|US&nbsp;29]] at Centreville was opened. A disconnected {{Convert|3.3|mi|km|-long|adj=mid}} section near [[Delaplane, Virginia|Delaplane]] in [[Fauquier County, Virginia|Fauquier County]] opened next in May&nbsp;1962.{{cn|date=September 2023}}

In July&nbsp;1962, the highway department bought the Rosslyn Spur of the W&OD for $900,000 (equivalent to ${{Formatprice|{{inflation|US-GDP|900000|1962}}}} in {{Inflation/year|index=US-GDP}}{{Inflation/fn|index=US-GDP}}) and began clearing the way, such that, by 1965, all that remained was dirt and the shattered foundations of 200&nbsp;homes cleared for the highway.<ref>{{cite news |title=Rail Spur Quiet for While: But the Old W&OD Route Soon Will Hum With Autos |newspaper=The Washington Post |date=16 November 1964}}</ref><ref>{{cite news |title=W&OD Rail Spur Bought by State |newspaper=The Washington Post |date=10 July 1962}}</ref><ref>{{cite news |last1=Cheek |first1=Leslie |title=I-66 in Arlington Planned As Model of Road Beauty |newspaper=The Washington Post |date=15 October 1965}}</ref> In February&nbsp;1965, the state contracted to buy {{Convert|30.5|mi|km}} of the W&OD from Herndon to Alexandria for $3.5&nbsp;million (equivalent to ${{Formatprice|{{inflation|US-GDP|3500000|1965}}}} in {{Inflation/year|index=US-GDP}}{{Inflation/fn|index=US-GDP}}) and the C&O petitioned the ICC to let them abandon it. The purchase would eliminate the need to build a grade separation for I-66 and would provide {{Convert|1.5|mi|km}} of right-of-way for the highway, saving the state millions.<ref>{{cite news |title=ICC Examiner Favors Death of W&OD Line |newspaper=The Washington Post |date=8 March 1966}}</ref> The abandonment proceedings took more than three years, as customers of the railway and transit advocates fought to keep the railroad open and delayed work on the highway.<ref>{{cite news |title=Ailing Va. Railroad Allowed to Quit in '68 |newspaper=The Washington Post |date=25 January 1968 |ref=Ailing}}</ref> During that time, on November&nbsp;10, 1967, the [[Washington Metropolitan Area Transit Authority]] (WMATA) announced that it had come to an agreement with the Highway Department that would give them a two-year option to buy a {{Convert|5|mi|km|adj=on|spell=in}} stretch of the right-of-way from Glebe Road to the Beltway, where I-66 was to be built, and run mass transit on the median of it.<ref>{{cite news |last1=Corrigen |first1=Richard |title=WMATA Agrees On Rail Bed Route |newspaper=The Washington Post |date=2 November 1967}}</ref> The W&OD ran its last train during the summer of 1968, clearing the way for construction to begin in Arlington County.

While the state waited on the W&OD, work continued elsewhere. The Theodore Roosevelt Bridge opened on June&nbsp;23, 1964, and, in November of that year, the section from Centerville to the Beltway opened. A {{Convert|0.2|mi|km|adj=on}} extension from the Roosevelt Bridge to Rosslyn opened in October&nbsp;1966.

After the [[Virginia Department of Transportation]] (VDOT; then known as the Virginia Department of Highways) took possession of the mainline W&OD right-of-way in 1968, they began to run into opposition as the [[highway revolt]]s of the late 1960s and early 1970s took hold. In 1970, the Arlington County Board requested new hearings, and opponents began to organize marches.<ref>{{cite news |title=1-66 Opponents Schedule Walk |newspaper=The Washington Post |date=25 October 1970}}</ref><ref>{{cite news |title=ew Hearing Requested On Va. Designs for I-66 |newspaper=The Washington Post |date=5 October 1970}}</ref> At the same time, the federal government wanted to pave the right-of-way from Washington Boulevard and Glebe Road to Rosslyn for an experimental busway, which Arlington County opposed, in part because they thought it might delay and add to the cost of I-66.<ref>{{cite news |last1=Beckham |first1=Nancy |title=Express Busway Objections Outlined to Arlington Board |work=The Evening Star |date=4 January 1970}}</ref> A significant delay was encountered when the [[Arlington Coalition on Transportation]] (ACT) filed a lawsuit in [[United States District Court for the Eastern District of Virginia|Federal District Court]] in 1971 opposing the Arlington County portion of the project. The group objected to that urban segment due to concerns over [[air quality]], [[noise]], unwanted traffic congestion, wasteful spending, impacts on mass transit, and wasted energy by auto travel.<ref name="Lynton" /> In 1972 the [[US Fourth Circuit Court of Appeals]] ruled in favor of ACT, technically blocking any construction. The [[Supreme Court of the United States|US Supreme Court]] upheld the ruling in favor of ACT later that same year.<ref>{{cite news |first=Jay |last= Mathews |title=High Court Backs Delay of Rte. 66 |newspaper=The Washington Post |date=November 7, 1972 |page=A1}}</ref>

Again, work continued elsewhere, and, in October&nbsp;1971, the {{Convert|6.6|mi|km|-long|adj=mid}} section from I-81 to US&nbsp;340/US&nbsp;522 north of Front Royal opened.

In July&nbsp;1974, a final [[environmental impact statement]] (EIS) was submitted.<ref name=Idea>{{cite web|archive-url=https://web.archive.org/web/20120123024139/http://www.virginiadot.org/projects/idea66/background.asp|archive-date=January 23, 2012|url=http://www.virginiadot.org/projects/idea66/background.asp|title=Background: I-66 History|work=Idea-66|publisher=[[Virginia Department of Transportation]]|access-date=February 25, 2013}}</ref> The EIS proposed an eight-lane [[limited access expressway]] from the [[Capital Beltway]] to the area near [[Spout Run Parkway]].<ref name=Idea /> Six lanes would branch off at the Parkway and cross the [[Potomac River]] via a proposed [[Three Sisters Bridge (District of Columbia)|Three Sisters Bridge]].<ref name=Idea /> Another six lanes would branch off to the [[Theodore Roosevelt Bridge]].<ref name=Idea /> In November, a modified design was submitted, reducing the eight lanes to six. However, in 1975, VDOT disapproved the six-lane design.<ref name=Idea />

The parties then agreed on experts to conduct [[air quality]] and noise studies for VDOT, selecting the firm of [[ESL Incorporated]], the expert hired originally by ACT. In 1976, [[United States Secretary of Transportation]] [[William Thaddeus Coleman Jr.]] intervened. On January&nbsp;4, 1977, Coleman approved federal aid for a much narrower, four-lane limited access highway between the Capital Beltway and the Theodore Roosevelt Bridge.<ref name=Idea /> As part of the deal, Virginia officials agreed to provide more than $100&nbsp;million (equivalent to ${{Formatprice|{{inflation|US-GDP|100000000|1977}}}} in {{Inflation/year|index=US-GDP}}{{Inflation/fn|index=US-GDP}}) in construction work and funds to help build the Metro system, which has tracks down the I-66 median to a station at [[Vienna, Virginia|Vienna]] in Fairfax County; to build a [[multiuse trail]] from Rosslyn to Falls Church; and to limit rush-hour traffic mainly to car pools.<ref name=Idea /><ref>{{cite web |title=An Abridged I-66 Chronology |work=The Arlington Coalition for Sensible Transportation |url=http://www.acstnet.org/66part6.htm |access-date=February 5, 2006 |url-status=dead |archive-url=https://web.archive.org/web/20060809011723/http://www.acstnet.org/66part6.htm |archive-date=August 9, 2006 |df=mdy-all}}</ref><ref>{{cite book |last1=Hogan |first1=C. M. |first2=Harry |last2=Seidman |name-list-style=amp |title=Air Quality and Acoustics Analysis of Proposed I-66 through Arlington, Virginia |publisher=ESL Inc. |id=Technical Document T1026 |location=Sunnyvale, CA |year=1971}}</ref> Three more lawsuits would follow, but work began on August&nbsp;8, 1977, moments after US District Court Judge Owen R. Lewis denied an injunction sought by highway opponents.<ref>{{cite news |last1=Boodman |first1=Sandra |last2=McCallister |first2=Bill |title=Virginia Crew Starts Clearing Path for I-66 |newspaper=The Washington Post |date=9 August 1977}}</ref>

In the late 1970s and early 1980s, the highway's final miles were built. A {{Convert|2.9|mi|km|-long|adj=mid}} section from Delaplane to US&nbsp;17 east of Marshall was completed in two sections in 1978 and 1979. The {{Convert|15.6|mi|km|-long|adj=mid}} section from US&nbsp;340 to Delaplane was completed in August&nbsp;1979. A {{Convert|12|mi|km|adj=on}} section between US&nbsp;17 in Marshall and US&nbsp;15 in [[Haymarket, Virginia|Haymarket]] opened in December&nbsp;1979, with the gap between Haymarket and Gainesville closed on December&nbsp;19, 1980.<ref>{{cite news |title=12 More Miles of I-66 |newspaper=The Washington Post |date=27 December 1979}}</ref> On December&nbsp;22, 1982, the final section of I-66 opened between the Capital Beltway and US&nbsp;29 (Lee Highway) in Rosslyn, near the Virginia end of the Theodore Roosevelt Bridge.<ref name=Idea/>

The [[Custis Trail]], the trail along I-66 built between Rosslyn and Falls Church as a concession, opened in the summer of 1982, before the highway was complete. [[Virginia State Route 267|SR&nbsp;267]] ([[Dulles Access Road]]) between I-66 and the airport opened in 1984.<ref name=Idea /> The Metrorail in the median of I-66 between [[Ballston, Virginia|Ballston]] and Vienna, another concession, opened on June&nbsp;7, 1986.

After opening, the restrictions on use began to loosen. In 1983, Virginia dropped the HOV requirement from 4 to 3 and then from 3 to 2 in 1994. In 1992, motorcycles were allowed.<ref name=Idea />

On October&nbsp;9, 1999, [[Act of Congress|Public Law]] 106-69 transferred from the federal government to the [[Virginia|Commonwealth of Virginia]] the authority for the operation, maintenance, and construction of I-66 between Rosslyn and the Capital Beltway.<ref>{{cite web|url=http://www.gpo.gov/fdsys/pkg/PLAW-106publ69/pdf/PLAW-106publ69.pdf|title=Department of Transportation and Related Agencies Appropriations Act, 2000: Public Law 106-69: 106th Congress|work=Sec. 357|page=113 Stat. 1027|date=October 9, 1999|publisher=[[United States Government Printing Office]]|access-date=February 25, 2013|quote=Sec. 357. (a) Notwithstanding the January 4, 1977, decision of the Secretary of Transportation that approved construction of Interstate Highway 66 between the Capital Beltway and Rosslyn, Virginia, the Commonwealth of Virginia, in accordance with existing Federal and State law, shall hereafter have authority for operation, maintenance, and construction of Interstate Route 66 between Rosslyn and the Capital Beltway, except as noted in paragraph (b).<br />(b) The conditions in the Secretary's January 4, 1997 decision, that exclude heavy duty trucks and permit use by vehicles bound to or from Washington Dulles International Airport in the peak direction during peak hours, shall remain in effect.|url-status=live |archive-url=https://web.archive.org/web/20160307024623/https://www.gpo.gov/fdsys/pkg/PLAW-106publ69/pdf/PLAW-106publ69.pdf|archive-date=March 7, 2016|df=mdy-all}}</ref>

Because I-66 is the only Interstate Highway traveling west from Washington, D.C., into [[Northern Virginia]], traffic on the road is often extremely heavy. For decades, there has been talk of widening I-66 from two to three lanes each way inside the Capital Beltway (I-495) through Arlington County, Virginia, although many Arlington residents are adamantly opposed to this plan. In 2004–2005, Virginia studied options for widening the highway inside the Beltway, including the prospect of implementing a one-lane-plus-shoulder extension on westbound I-66 within the Beltway (in an attempt to reduce congestion for people commuting away from D.C.).<ref>{{cite news |first=Ron |last=Shaffer |title=Dr. Gridlock |date=October 21, 2005 |newspaper=[[The Washington Post]] |url=https://www.washingtonpost.com/wp-dyn/content/discussion/2005/10/21/DI2005102101155.html |url-status=live |archive-url=https://web.archive.org/web/20160304000207/http://www.washingtonpost.com/wp-dyn/content/discussion/2005/10/21/DI2005102101155.html |archive-date=March 4, 2016 |df=mdy-all}}</ref> They later settled on three planned "spot improvements" meant to ease traffic congestion on westbound I-66 inside the Capital Beltway. The first "improvement", a {{Convert|1.9|mi|km|adj=on}} zone between Fairfax Drive and Sycamore Street, started in summer 2010 and was finished in December&nbsp;2011. For this project, the entrance ramp acceleration lane and the exit ramp deceleration lanes were lengthened to form a continuous lane between both ramps. The {{Convert|12|ft|m|adj=on}} shoulder lane can carry emergency vehicles and can be used in emergency situations.<ref>{{cite news |title=I-66 Spot Improvements-Spot 1 |date=August 25, 2011 |publisher=Virginia Department of Transportation |url=http://www.virginiadot.org/projects/northernvirginia/i-66_spot_improvements_-_spot_1.asp |url-status=dead |archive-url=https://web.archive.org/web/20110808144814/http://www.virginiadot.org/projects/northernvirginia/i-66_spot_improvements_-_spot_1.asp |archive-date=August 8, 2011 |df=mdy-all}}</ref><ref>{{cite news |last1=Thompson |first1=Robert |title=Work to begin on second 'spot improvement' for I-66 |url=https://www.washingtonpost.com/news/dr-gridlock/wp/2013/10/18/work-to-begin-on-second-spot-improvement-for-i-66/ |access-date=12 October 2018 |date=18 October 2013}}</ref> The second one widened {{convert|1.675|mi|km}} between the Washington Boulevard onramp and the ramp to the Dulles Access Road. Work on it began in 2013 and finished in 2015.<ref>{{cite web |title=I-66 Spot 2 Improvements Project|url=http://www.ces-consultingllc.com/2017/03/03/i-66-spot-2-improvements-project/ |access-date=12 October 2018}}</ref> The third project, between Lee Highway/[[Spout Run]] and Glebe Road, is scheduled for completion in 2020.<ref>{{cite web |title=I-66 Multimodal Improvement Project inside the Capital Beltway |url=http://www.transportationplanninghub.org/high-profile-projects/i-66-multimodal-improvement-project-inside-capital-beltway |access-date=12 October 2018}}</ref>{{Update after|2020}}

In Gainesville, Virginia, the Gainesville Interchange Project upgraded the interchange between US&nbsp;29 and I-66 for those and many other roads due to rapid development and accompanying heavy traffic in the Gainesville and Haymarket area. I-66's overpasses were reconstructed to accommodate nine lanes (six general purpose, two HOV, and one [[collector–distributor]] eastbound) and lengthened for the expansion of US&nbsp;29 to six lanes. These alterations were completed in June&nbsp;2010. In 2014–2015, US&nbsp;29 was largely grade-separated in the area, including an interchange at its current intersection with [[Virginia State Route 619 (Prince William County)|SR&nbsp;619]] (Linton Hall Road). The project began in 2004 and finished in 2015.<ref name=NVTA-Gainesville>{{cite web|url=http://www.nvta.org/content.asp?sl=459&contentid=1889|title=Gainesville Interchange Project|access-date=July 4, 2011|year=2011|url-status=dead |archive-url=https://web.archive.org/web/20120309034236/http://www.nvta.org/content.asp?sl=459&contentid=1889|archive-date=March 9, 2012|df=mdy-all}}</ref>

==== Transform 66 ====
[[File:2016-10-28 12 08 38 View east along Interstate 66 just east of Exit 52 (U.S. Route 29 to Virginia State Route 28 South, Centreville) in Centreville, Fairfax County, Virginia.jpg|thumb|I-66 eastbound past the [[U.S. Route 29 in Virginia|U.S. Route 29]] in [[Centreville, Virginia]]]]
The [[Virginia Department of Transportation]] announced its public-private partnership with the [[Virginia Department of Rail and Public Transportation]], and the private partner, I-66 Express Mobility Partners, with an estimating $3.7 billion dollars for transportation/road improvements along the I-66 corridor. The project, known as Transform 66, opened to traffic in November 2022 and the HOV rule changed from HOV-2+ to HOV-3+ in early December 2022.<ref>{{cite web |title=Transform 66 – Outside the Beltway – About the Project |url=https://outside.transform66.org/about_the_project/default.asp |website=outside.transform66.org |access-date= April 24, 2022}}</ref>

=====Timeline=====
[[File:2016-10-02 07 50 38 View north along U.S. Route 29 (west along the Whitehurst Freeway and K Street) at the eastern end of Interstate 66 (Potomac River Freeway) in Washington, D.C..jpg|thumb|The eastern terminus of I-66 at [[U.S. Route 29 in Virginia|U.S. Route 29]] in [[Washington, D.C.]]]]
In 2015, the [[Virginia Department of Transportation]] planning board added I-66 HOT lanes to their list of priority projects for the I-66 corridor.<ref>{{cite news |last1= Thomson |first1= Robert |title= I-66 HOT lanes plan reviewed by regional panel |url= https://www.washingtonpost.com/blogs/dr-gridlock/wp/2015/02/18/i-66-hot-lanes-plan-reviewed-by-regional-panel/ |newspaper= The Washington Post |date= February 18, 2015 |access-date= May 10, 2015 |url-status= live |archive-url= https://web.archive.org/web/20150508220148/http://www.washingtonpost.com/blogs/dr-gridlock/wp/2015/02/18/i-66-hot-lanes-plan-reviewed-by-regional-panel/ |archive-date= May 8, 2015 |df= mdy-all }}</ref> The projects have sparked opposition between residents and community businesses over the direction of this region's future infrastructure planning. The VDOT established a "Transform 66" website on regional traffic issues. Residents living within the I-66 corridor have set up "Transform 66 Wisely", a website describing local community impacts that the VDOT projects may cause. Local business groups and [[Chambers of Commerce]] located near the affected areas, however, supported the improvements.<ref>{{cite web|url=http://www.insidenova.com/news/business/fairfax/commentary-business-groups-urge-action-on-i--outside-the/article_01965472-ec2e-11e4-89b2-d3a21ba6ae14.html#user-comment-area|title=Commentary: Business groups urge action on I-66 outside the Beltway|work=INSIDENOVA.COM|date=April 29, 2015 }}</ref>

Residents along the I-66 corridor, such as in Arlington County, have resisted I-66 widening proposals for many years.<ref>{{cite news|url=https://www.washingtonpost.com/local/trafficandcommuting/officials-to-consider-road-widening-hot-lanes-through-arlington-portion-of-i-66/2014/12/12/2bf9a97e-824a-11e4-9f38-95a187e4c1f7_story.html|title=Officials to consider road widening, HOT lanes through Arlington portion of I-66|newspaper=[[The Washington Post]]|url-status=live|archive-url=https://web.archive.org/web/20160310163533/https://www.washingtonpost.com/local/trafficandcommuting/officials-to-consider-road-widening-hot-lanes-through-arlington-portion-of-i-66/2014/12/12/2bf9a97e-824a-11e4-9f38-95a187e4c1f7_story.html|archive-date=March 10, 2016|df=mdy-all}}</ref> The local Stenwood Elementary School would lose its attached field, leaving it with blacktop-only recess space.<ref>{{cite web|url=http://wtop.com/fairfax-county/2015/04/deal-close-save-homes-66-widening/|title=Deal close to save homes from I-66 widening|date=April 29, 2015 |publisher=WTOP|url-status=live|archive-url=https://web.archive.org/web/20150502232728/http://wtop.com/fairfax-county/2015/04/deal-close-save-homes-66-widening/|archive-date=May 2, 2015|df=mdy-all}}</ref> In an April&nbsp;16, 2015, letter to the Virginia Secretary of Transportation, members of the 1st, 8th, 10th, and 11th districts of Congress wrote that VDOT research noted that, during peak hours, 35&nbsp;percent of eastbound cars and 50&nbsp;percent of westbound cars are HOV violators.

Future federal steps for VDOT include [[National Environmental Policy Act]] (NEPA) review, obligation of federal funds, certification that the conversion to tolled facilities will not "degrade" the existing facility, and potential federal loan guarantee. The Virginia Commonwealth Transportation Board (CTB) is responsible for overseeing VDOT and allocating highway funding to specific projects. The board has 18&nbsp;members appointed by the Governor,<ref>{{cite web |title=CTB Member Roll |url=http://www.ctb.virginia.gov/resources/14058_CTB_may2014.pdf |url-status=live |archive-url=https://web.archive.org/web/20150518103405/http://www.ctb.virginia.gov/resources/14058_CTB_may2014.pdf |archive-date=May 18, 2015 |df=mdy-all}}</ref> includes the Virginia Secretary of Transportation, [[Aubrey Layne]], and is the group that will be making the final decision and allocating funding for VDOT's plans for I-66.

In 2016, VDOT announced that it was planning to add express lanes and multimodal transportation improvements to I-66 outside the Beltway (the "Transform 66 Outside the Beltway" improvement project). A decision was also made to move forward with widening I-66 eastbound and make multimodal improvements from the Dulles Airport connector to Ballston, the "Transform 66 Inside the Beltway" improvement project.<ref>{{cite web |title=PLANS TO EXTEND I-395 EXPRESS LANES LAUNCHED |url=http://inside.transform66.org/documents/march2016_01_asset_upload_file263_79566.pdf |archive-url=https://ghostarchive.org/archive/20221010/http://inside.transform66.org/documents/march2016_01_asset_upload_file263_79566.pdf |archive-date=2022-10-10 |url-status=live |access-date=12 October 2018}}</ref>

VDOT also announced during 2016 that it would initiate on I-66 a dynamic tolling system in the peak travel directions during rush hours. On December&nbsp;4, 2017, VDOT converted {{convert|10|mi|km|}} of I-66 between US&nbsp;29 in Rosslyn and the Capital Beltway to an HOV variable [[congestion pricing]] tolling system. The system permits solo drivers to use I-66 during peak travel hours in the appropriate direction if they pay a toll.<ref>{{cite news |last1=Lazo |first1=Luz |title=Interstate 66 tolling starts Monday. Here's what you need to know. |url=https://www.washingtonpost.com/local/trafficandcommuting/interstate-66-tolling-starts-monday-heres-what-you-need-to-know/2017/12/02/800454e2-d535-11e7-a986-d0a9770d9a3e_story.html |access-date=12 October 2018 |date=2 December 2017}}</ref>

VDOT designed the price of toll to keep traffic moving at a minimum of {{convert|45|mph|km/h|abbr=on}} and to increase the capacity of the road. Carpools and vanpools (with three or more people),{{Update after|2022}} transit, on-duty law enforcement and first responders will not pay a toll.<ref name=inside>{{Cite web|url=http://inside.transform66.org/default.asp|title=Transform 66 in Northern Virginia|work=Inside the Beltway|language=en|access-date=February 9, 2017|url-status=live|archive-url=https://web.archive.org/web/20170211080600/http://inside.transform66.org/default.asp|archive-date=February 11, 2017|df=mdy-all}}</ref> Prices ranged up to $47 for solo drivers, but the average speed during the morning rush hour was {{convert|57|mph|km/h|abbr=on}} versus {{convert|37|mph|km/h|abbr=on}} a year before.<ref>{{Cite news |last=Schaper |first=Davis |title=Are $40 Toll Roads The Future? |language=en |publisher=NPR |url=https://www.npr.org/2017/12/12/570248568/are-40-toll-roads-the-future |url-status=live |access-date=December 12, 2017 |archive-url=https://web.archive.org/web/20171213004447/https://www.npr.org/2017/12/12/570248568/are-40-toll-roads-the-future |archive-date=December 13, 2017 |df=mdy-all}}</ref><ref>{{Cite news |last1=Massimo |first1=Rick |last2=Nadeem |first2=Reem |date=December 4, 2017 |title=Tolls stabilize during first afternoon rush hour on I-66 inside Beltway |language=en-US |publisher=WTOP |location=Washington, DC |url=https://wtop.com/dc-transit/2017/12/interstate-66-rush-hour-tolls-begin-inside-beltway/ |url-status=live |access-date=December 13, 2017 |archive-url=https://web.archive.org/web/20171213143446/https://wtop.com/dc-transit/2017/12/interstate-66-rush-hour-tolls-begin-inside-beltway/ |archive-date=December 13, 2017 |df=mdy-all}}</ref>

In 2017, construction began on the "Transform 66 Outside the Beltway" improvement project.<ref>{{Cite web|url=http://outside.transform66.org/|title=Transform 66 in Northern Virginia – Outside the Beltway|website=outside.transform66.org|language=en|access-date=2017-02-09|url-status=live|archive-url=https://web.archive.org/web/20170306201714/http://outside.transform66.org/|archive-date=March 6, 2017|df=mdy-all}}</ref> The project added {{convert|22.5|mi|km}} of new dynamically-tolled express lanes alongside I-66 from I-495 to University Boulevard in Gainesville. It also built new park and ride facilities, interchange improvements and {{convert|11|mi|km}} of expanded multi-use trail. The project was completed in November&nbsp;2022.<ref>{{Cite web|url=https://outside.transform66.org/|title=Transform 66 - Outside the Beltway|website=outside.transform66.org}}</ref>

Construction on widening eastbound I-66 as part of the "Transform 66 Inside the Beltway" improvement project began in June&nbsp;2018 and  was completed in 2020. The project added a travel lane on eastbound I-66 between the Dulles Access Road and [[Virginia State Route 237|Fairfax Drive]] (exit&nbsp;71) in Ballston, and provided a new ramp-to-ramp direct access connection from eastbound I-66 to the [[West Falls Church station]] at the SR&nbsp;7 interchange and provided a new bridge for the [[Washington & Old Dominion Railroad Regional Park|W&OD Trail]] over US&nbsp;29.<ref name=inside />{{Update after|2020}}

VDOT completed in August&nbsp;2018 a [[diverging diamond interchange]] in Haymarket at the interchange of I-66 with [[U.S. Route 15 in Virginia|US&nbsp;15]].<ref>{{cite news |title=Diverging-diamond completion to be celebrated in Haymarket |url=https://www.insidenova.com/news/transportation/prince_william/diverging-diamond-completion-to-be-celebrated-in-haymarket/article_d1fbf8b2-9be7-11e8-8943-bbb156217784.html |access-date=11 October 2018 |work=InsideNova |date=August 9, 2018}}</ref><!-- <ref>{{cite news |last1=Pascale |first1=Jordan |title=First Ride: Northern Virginia Opens New "66-Parallel" Bike And Walking Trail |url=https://dcist.com/story/23/05/17/first-ride-northern-virginia-opens-new-66-parallel-bike-and-walking-trail/ |archive-url=https://web.archive.org/web/20230517221900/https://dcist.com/story/23/05/17/first-ride-northern-virginia-opens-new-66-parallel-bike-and-walking-trail/ |url-status=live |archive-date=May 17, 2023 |access-date=18 May 2023 |work=DCist |date=17 May 2023 |language=en}}</ref><ref>{{cite news |title=Time to ride: Shared-use path parallel to I-66 officially opens in Vienna |url=https://www.insidenova.com/headlines/time-to-ride-shared-use-path-parallel-to-i-66-officially-opens-in-vienna/article_befe4c00-f589-11ed-9e40-7b63cd123303.html |access-date=18 May 2023 |work=INSIDENOVA.COM |date=18 May 2023 |language=en}}</ref> -->

===Washington, D.C.===
[[File:2018-10-25 13 51 18 View west along Interstate 66 (Potomac River Freeway) from the overpass for Triangle Park-Virginia Avenue-New Hampshire Avenue-25th Street in Washington, D.C..jpg|thumb|The Potomac River Freeway (I-66) in Washington, D.C.]]
[[File:I66toscale.png|thumb|right|500px|A map of I-66, showing cities and interchanges with [[Interstate 81 in Virginia|I-81]] and [[Interstate 495 in Virginia|I-495]]]]
In Washington D.C., I-66 was planned to extend east of its current terminus along the North Leg of the [[Inner Loop (Washington, D.C.)|Inner Loop]] freeway. I-66 would have also met the eastern terminus of the planned [[Interstate 266|I-266]] at US&nbsp;29, and the western terminus of [[Interstate 695 (District of Columbia)|I-695]] (South Leg Freeway) at US&nbsp;50; I-266 would have been a parallel route to I-66, providing more direct access to the North Leg from points west, while I-695 would have been an inner-city connector between I-66 and I-95.

The final plans for the North Leg Freeway, published in 1971, outlined a {{convert|1.5|mi|km|adj=on}} six-lane tunnel beneath [[K Street (Washington, D.C.)|K Street]], between I-266/US&nbsp;29 and New York Avenue, where the North Leg would emerge from the tunnel and join with the [[Center Leg (DC)|Center Leg Freeway]] (formerly I-95, now I-395); the two routes would run concurrently for {{Convert|0.75|mi|km}} before reaching the [[Union Station (Washington, D.C.)|Union Station]] interchange, where I-66 was planned to terminate. Despite the plan to route the North Leg in a tunnel beneath K Street, the intense opposition to previous, scrapped alignments for the D.C. freeway network, which included previous alignments for the North Leg Freeway, led to the mass cancelation of all unbuilt D.C. freeways in 1977, resulting in the truncation of I-66 at US&nbsp;29.
{{Clear}}

== Exit list ==
All exits in the District of Columbia are unnumbered.{{jcttop|old|state_col=State/district|length_ref=<ref name="google maps dc">{{Google maps |url=https://goo.gl/maps/TzmSrgfoXbeA38cLA |access-date=January 31, 2020}}</ref>}}
{{VAint|old
|sspan=49
|county=Frederick
|location=none
|mile=0.00
|exit=1
|old=
|road={{Jct|state=VA|I|81|city1=Roanoke|city2=Winchester}}
|notes=Western terminus; signed as exits 1A (south) and 1B (north); exit 300 on I-81; [[directional T interchange|tri-stack interchange]]
}}
{{VAint|old
|county=Warren
|cspan=2
|location=Front Royal
|mile=6.4
|exit=6
|old=2
|road={{Jct|state=VA|US|340|US|522|city1=Winchester|city2=Front Royal}}
}}
{{VAint|old
|location=none
|mile=12.9
|exit=13
|old=3
|road={{Jct|state=VA|SR|79|to2=to|SR|55|city1=Linden|city2=Front Royal}}
}}
{{VAint|old
|county=Fauquier
|cspan=5
|location=Markham
|ctdab=Fauquier
|mile=18.5
|exit=18
|old=4
|road={{jct|state=VA|Sec|688|county1=Fauquier|location1=[[Markham, Fauquier County, Virginia|Markham]]}}
}}
{{VAint|old
|location=Delaplane
|mile=23.3
|exit=23
|old=5
|type=concur
|road={{Jct|state=VA|US|17|dir1=north|SR|55|dir2=west|Sec|731|county3=Fauquier|city1=Delaplane|city2=Paris}}
|notes=Western terminus of US&nbsp;17 / SR&nbsp;55 [[concurrency (road)|concurrency]]
}}
{{VAint|old
|location=none
|mile=27.0
|exit=27
|old=6
|type=concur
|road={{jct|state=VA|SR|55|dir1=east|name1=[[U.S. Route 17 Business (Marshall, Virginia)|US 17 Bus.]] south|Sec|647|county2=Fauquier|city1=Marshall}}
|notes=Eastern terminus of SR&nbsp;55 concurrency; former [[Virginia State Route 242 (1933–1948)|SR&nbsp;242]] south
}}
{{VAint|old
|location=none
|mile=28.3
|exit=28
|old=7
|type=concur
|road={{Jct|state=VA|US|17|dir1=south|US-Bus|17|dab2=Marshall|dir2=north|city1=Marshall|city2=Warrenton|city3=Fredericksburg}}
|notes=Eastern terminus of US&nbsp;17 concurrency
}}
{{VAint|old
|location=none
|mile=31.3
|exit=31
|old=8
|road={{Jct|state=VA|SR|245|city1=The Plains|city2=Old Tavern}}
}}
{{VAint|old
|county=Prince William
|cspan=9
|location=Haymarket
|mile=40.5
|exit=40
|old=9
|road={{Jct|state=VA|US|15|city1=Haymarket|city2=Leesburg}}
|notes=[[Diverging diamond interchange]]
}}{{VAint|old|location=none|mile=|type=hov|road={{jct|state=VA|I-Express|66|dir1=east}}|notes=Western terminus of HOV3+/toll lanes|exit=♦}}
{{VAint|old
|location=Gainesville
|mile=43.1
|exit=43
|old=10
|road={{Jct|state=VA|US|29|city1=Gainesville|city2=Warrenton}}
|notes=Signed as exits 43A (south) and 43B (north)
|lspan=2}}{{VAint|old|road=University Boulevard to {{Jct|state=VA|US|29}}|type=hov|notes=Westbound exit and eastbound entrance from HOV3+/toll lanes|mile=|exit=♦}}
{{VAint|old
|location=none
|mile=44.5
|exit=44
|old=11
|type=concur
|road={{Jct|state=VA|SR|234|dir1=south|name1=[[Prince William Parkway]]|city1=Manassas|city2=Dumfries}}
|notes=Western terminus of SR&nbsp;234 concurrency
|lspan=2}}{{VAint|old|road={{jctname|state=VA|Sec|621|county1=Prince William|name1=Balls Ford Road}}|type=hov|notes=Westbound exit and eastbound entrance from HOV3+/toll lanes|mile=|exit=♦}}
{{VAint|old
|location=none
|mile=47.3
|exit=47
|old=12
|type=concur
|road={{Jct|state=VA|SR|234|dir1=north|SR-Bus|234|dab2=Manassas|dir2=south|city1=Manassas|location2=[[Manassas National Battlefield Park]]}}
|notes=Eastern terminus of SR&nbsp;234 concurrency; signed as exits 47A (south) and 47B (north) westbound
|lspan=2}}{{VAint|old|road={{Jct|state=VA|SR|234|dir1=north|SR-Bus|234|dab2=Manassas|dir2=south}}|notes=Eastbound entrance to HOV3+/toll lanes|type=hov|mile=|exit=♦}}
{{VAint|old
|county= 
|location=none
|mile=48.8
|place=[[Rest area]]
}}
{{VAint|old
|county=Fairfax
|cspan=23
|location=Centreville
|mile=52.1
|exit=52
|old=13
|road={{Jct|state=VA|US|29|to2=to|SR|28|dir2=south|city1=Centreville}}
}}
{{VAint|old
|location1=Centreville
|location2=Chantilly
|lspan=3
|mile=53.2
|mspan=2
|exit=53B
|old=14
|ospan=2
|type=incomplete
|road={{Jct|state=VA|SR|28|dir1=north|extra=airport|location1=[[Dulles International Airport]]}}
|notes=Signed as exit 53 eastbound; no westbound entrance. Direct access to SR 620 (Braddock Rd), and SR 657 (Walney Rd); westbound entrance from SR 620
}}
{{VAint|exit
|mile=none
|exit=53A
|type=incomplete
|road={{jct|state=VA|SR|28|dir1=south|city1=Centreville}}
|notes=Westbound exit and eastbound entrance
}}{{VAint|old|road={{Jct|state=VA|SR|28|dir1=north|extra=airport|location1=[[Dulles International Airport]]}}|notes=Access from HOV3+/toll lanes|type=hov|exit=|mile=}}
{{VAint|old
|location=Fair Lakes
|lspan=2
|mile=54.9
|type=hov
|exit=♦
|road={{jctname|state=VA|Sec|645|county1=Fairfax|name1=Stringfellow Road|noshield1=yes}}
|notes=Westbound exit and eastbound entrance from HOV3+/toll lanes
}}
{{VAint|old
|mile=55.9
|exit=55
|old=15
|road={{Jct|state=VA|SR|286|name1=Fairfax County Parkway|city1=Springfield|city2=Reston|city3=Herndon}}
|notes=Signed as exits 55A (south) and 55B (north)
}}
{{VAint|old
|location=Fair Oaks
|ctdab=Fairfax
|lspan=3
|mile=57.1
|exit=♦
|type=hov
|road={{jctname|state=VA|Sec|6751|name1=Monument Drive|noshield1=yes}}
|notes=Access from HOV3+/toll lanes
}}
{{VAint|old
|mile=58.1
|exit=57
|old=16
|road={{Jct|state=VA|US|50|city1=Fair Oaks|countydab1=Fairfax|city2=Fairfax}}
|notes=Signed as exits 57A (east) and 57B (west)
|mspan=2}}{{VAint|road={{Jct|state=VA|US|50|dir1=west|city1=Fair Oaks|countydab1=Fairfax}}|notes=Westbound exit and eastbound entrance from HOV3+/toll lanes|type=hov|exit=♦|location=|miles=}}
{{VAint|old
|location=Oakton
|lspan=4
|mile=60.1
|old=17
|exit=60
|road={{Jct|state=VA|SR|123|city1=Fairfax|city2=Vienna}}
|mspan=2}}{{VAint|road={{Jct|state=VA|SR|123|city1=Fairfax|city2=Vienna}}|notes=Access via HOV3+/toll lanes|type=hov|exit=♦|mile=|location=}}{{VAint|old|type=hov|road=Vaden Drive - {{jct|extra=rail}} [[Vienna station (Washington Metro)|Vienna/Fairfax-GMU Station]]|notes=Eastbound exit and westbound entrance from HOV3+/toll lanes|exit=♦|mile=}}
{{VAint|old
|ospan=2
|espan=2
|mile=61.6
|old=17A
|exit=62
|road={{jct|extra=rail}} [[Vienna station (Washington Metro)|Vienna/Fairfax-GMU Station]]
|notes=Accessible via [[collector–distributor road|C/D lanes]].
Signed as 62A (Vienna/Fairfax - GMU) and 62B (Nutley Street) in the westbound direction
|nspan=2
}}
{{VAint
|location1=Oakton
|location2=Merrifield
|mile=62.5
|road={{Jct|state=VA|SR|243|name1=Nutley Street|city1=Vienna|city2=Fairfax}}
|notes=none}}
{{VAint|old
|location1=Dunn Loring
|location2=Merrifield
|location3=Idylwood
|lspan=4
|mile=65.1
|mspan=4
|exit=64A
|old=18
|ospan=2
|road={{jct|state=VA|I|495|dir1=south|city1=Richmond|city2=Alexandria}}
|notes=Signed as exit 64 westbound; exit 49 on I-495
}}
{{VAint|exit
|mile=none
|exit=64B
|type=incomplete
|road={{Jct|state=VA|I|495|dir1=north|city1=Tysons Corner|location2=[[Baltimore]]}}
|notes=Eastbound exit and westbound entrance; exit 49 on I-495
}}
{{VAint|old
|type=etc
|mile=none
|exit=—
|road={{jct|state=VA|I-Express|495|city1=Richmond|location2=[[Baltimore]]}}
|notes=Eastbound exit and westbound entrance
}}{{VAint|old|road={{jct|state=VA|I|495|I-Express|495|city1=Tysons Corner|location2=[[Baltimore]]|city3=Richmond|city4=Alexandria}}|notes=Eastbound exit and westbound entrance from HOV3+/toll lanes only|type=hov|mile=none|exit=♦}}
{{VAint|old|location=Idylwood|lspan=2|type=hov|road={{jct|state=VA|I-Express|66|dir1=west}}|notes=Eastern terminus of HOV3+/toll lanes|mile=|exit=♦}}{{jctplace|old
|mile=
|type=etc
|place=Toll gantry (non-HOV3+ vehicles, peak-direction only)<ref name=express-lanes/>
}}
{{VAint|old
|location1=Pimmit Hills
|location2=Idylwood
|lspan=2
|mile=66.0
|exit=66
|old=19
|road={{Jct|state=VA|SR|7|name1=Leesburg Pike|city1=Tysons Corner|city2=Falls Church}}
|notes=Signed as exits 66A (east) and 66B (west) westbound; serves [[West Falls Church station]]
}}
{{VAint|old
|mile=66.6
|exit=67
|old=20
|type=incomplete
|road={{Jct|state=VA|SR|267|dir1=west|to2=to|I|495|dir2=north|location1=[[Dulles International Airport]]|location2=[[Baltimore]]}}
|notes=Westbound exit and eastbound entrance; eastern terminus of SR 267
}}
{{jctplace|old
|state=VA
|location=Westhampton
|mile=
|type=etc
|place=Toll gantry (non-HOV3+ vehicles, peak-direction only)<ref name=express-lanes/>
}}
{{VAint|old
|county=Arlington
|cspan=9
|location=East Falls Church
|lspan=3
|mile=67.8
|exit=68
|old=21
|type=incomplete
|road=Westmoreland Street
|notes=Eastbound exit only
}}
{{VAint|old
|type=incomplete
|mile=68.4
|exit=69
|old=22
|road={{Jct|state=VA|US|29|SR|237|name2=[[Washington Boulevard (Arlington)|Washington Boulevard]] / [[Lee Highway]]}}
|notes=Eastbound exit and westbound entrance
}}
{{VAint|old
|type=incomplete
|mile=
|exit=69
|old=23
|road={{jct|state=VA|road|Sycamore Street|city1=Falls Church}}
|notes=Westbound exit and eastbound entrance; serves [[East Falls Church station]]
}}
{{jctplace|old
|state=VA
|location=Bluemont
|ctdab=Arlington County
|mile=
|type=etc
|place=Toll gantry (non-HOV3+ vehicles, peak-direction only)<ref name=express-lanes/>
}}
{{VAint|old
|location=Ballston
|mile=70.5
|exit=71
|old=24
|road={{Jct|state=VA|SR|120|name1=Glebe Road|SR|237|name2=Fairfax Drive}}
|notes=Serves [[Ballston–MU station]]
}}
{{jctplace|old
|state=VA
|location=Cherrydale
|mile=
|type=etc
|place=Toll gantry (non-HOV3+ vehicles, peak-direction only)<ref name=express-lanes/>
}}
{{VAint|old
|location=Maywood
|mile=72.1
|exit=72
|old=25
|type=incomplete
|road={{Jct|state=VA|US|29|name1=[[Lee Highway]]|road|[[Spout Run Parkway]]}}
|notes=Eastbound exit and westbound entrance
}}
{{VAint|old
|location=Rosslyn
|lspan=2
|mile=73.1
|exit=73
|old=26
|road={{Jct|state=VA|US|29|name1=[[Lee Highway]]|city1=Rosslyn|location2=[[Key Bridge (Washington, D.C.)|Key Bridge]]}}
}}
{{VAint|old
|mile=74.2
|exit=75
|old=27
|type=incomplete
|road={{Jct|state=VA|SR|110|dir1=south|location1=[[The Pentagon|Pentagon]]|city2=Alexandria}}
|notes=Eastbound exit and westbound entrance
}}
{{jctbridge|old
|state_special=[[Virginia]]–[[District of Columbia|D.C.]] line
|sspan=2
|river=[[Arlington County, Virginia|Arlington]]–[[Washington, D.C.]] line
|lspan=2
|mile=74.8
|mile2=0.0
|line=yes
|place=[[Theodore Roosevelt Bridge]] over the [[Potomac River]]
}}
{{DCint|old
|mile=0.1
|exit=—
|type=concur
|road={{jct|state=VA|US|50|dir1=west|name1=[[Arlington Boulevard]]|GWMP||dir2=north}}
|notes=Western terminus of US&nbsp;50 concurrency; westbound exit and eastbound entrance
}}
{{DCint|old
|sspan=8
|indep_city=Washington
|lspan=8
|type=incomplete
|mile=0.5
|mspan=2
|exit=—
|road=[[Independence Avenue (Washington, D.C.)|Independence Avenue]]
|notes=Eastbound exit only
}}
{{DCint|old
|mile=none
|exit=—
|type=concur
|road={{Jct|state=DC|US|50|dir1=east|name1=[[Constitution Avenue]]|city1=Downtown}}
|notes=Eastern terminus of US&nbsp;50 concurrency; eastbound exit and westbound entrance
}}
{{DCint|old
|mile=0.7
|exit=—
|road=[[E Street Expressway]] east
|notes=Western terminus of the E Street Expressway
}}
{{DCint|old
|type=incomplete
|mile=0.8
|exit=—
|road=[[Kennedy Center]]
|notes=Westbound entrance only
}}
{{DCint|old
|mile=0.9
|exit=—
|type=incomplete
|road=[[Independence Avenue (Washington, D.C.)|Independence Avenue]] / [[Maine Avenue]]
|notes=Westbound exit and eastbound entrance
}}
{{DCint|old
|mile=1.2
|exit=—
|type=incomplete
|road=[[Rock Creek Parkway]]
|notes=Eastbound exit and westbound entrance
}}
{{DCint|old
|mile=1.4
|exit=—
|type=incomplete
|road=[[Pennsylvania Avenue]]
|notes=Eastbound exit only
}}
{{DCint|old
|mile=1.6
|exit=—
|road={{jctname|state=DC|US|29|dir1=south|name1=[[Whitehurst Freeway]]|noshield1=yes}} to [[Canal Road (Washington, D.C.)|Canal Road]]
|notes=Eastern terminus
}}
{{jctbtm|col=9|keys=concur,etc,hov,incomplete}}

== Cancelled auxiliary route ==
{{Infobox road small
|state=DC
|type=I
|route=266
|location=[[Arlington County, Virginia]]–[[Washington, D.C.]]
|length_mi=1.79
|length_ref=
|length_round=
|formed=
|deleted=
|header_type=former
}}
'''Interstate&nbsp;266''' ('''I-266''') was a proposed loop route of I-66 between [[Washington, D.C.]], and [[Arlington County, Virginia]]. D.C. officials proposed designating the route Interstate&nbsp;66N, a move opposed by [[AASHTO]]. In Virginia, I-266 would have split off from I-66 just east of the present [[Virginia State Route 124|SR&nbsp;124]] (Spout Run Parkway) exit. From there, it would have followed an expanded Spout Run Parkway, crossed the [[George Washington Memorial Parkway]], and crossed the [[Potomac River]] across a new bridge that would have been called the [[Three Sisters Bridge]]. Upon entering D.C., it would have followed [[Canal Road (Washington, D.C.)|Canal Road]] and an expanded [[U.S. Route 29 in the District of Columbia|US&nbsp;29]] (Whitehurst Freeway) to rejoin I-66 at [[K Street (Washington, D.C.)|K Street]]. I-266 was canceled in 1972 in the face of community opposition during Washington, D.C.'s [[Highway revolt|freeway revolts]].<ref name=rttf>{{cite web|url=http://www.roadstothefuture.com/DC_Interstate_Fwy.html|title=Original freeway plans for Washington, DC|access-date=October 6, 2014}}</ref>
{{Clear}}

== References ==
{{Reflist|30em}}

== External links ==
{{Commons category|Interstate 66}}
{{Attached KML|display=inline,title}}
* [http://outside.transform66.org/ Transform 66 Outside the Beltway Project]
* [http://www.virginiadot.org/travel/hov-default.asp#nova HOV schedule in Northern Virginia, from Virginia Dept. of Transportation]
* [http://www.dcroads.net/roads/I-66_VA/ Steve Anderson's DCRoads.net: Interstate 66 (Virginia)]

{{interstates}}
{{Streets in Washington, DC}}

{{start srbox}}
{{va browse|previous_type=SR|previous_route=65|route=[[State highways in Virginia|VA]]|next_type=SR|next_route=67}}
{{dc browse|previous_type=US|previous_route=50|route=[[List of Washington, D.C. numbered highways|DC]]|next_type=I|next_route=95}}
{{s-end}}
{{Authority control}}

[[Category:Interstate 66| ]]
[[Category:Interstate Highways in Washington, D.C.|66]]
[[Category:Interstate Highways in Virginia|66]]
[[Category:Transportation in Frederick County, Virginia]]
[[Category:Transportation in Warren County, Virginia]]
[[Category:Transportation in Fauquier County, Virginia]]
[[Category:Transportation in Prince William County, Virginia]]
[[Category:Transportation in Fairfax County, Virginia]]
[[Category:Transportation in Arlington County, Virginia]]
[[Category:Cancelled highway projects in the United States|66]]
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[[Категория:Английская Википедия]]
[[Категория:Википедия]]
[[Категория:Статья из Википедии]]
[[Категория:Статья из Английской Википедии]]