View source for Appalachian Development Highway System

{{Short description|Series of highway corridors in the Appalachia region of the eastern United States}}
{{infobox state highway system
|title=Appalachian Development Highway System
|shields=
|caption=
|map=ADHSMap.png
|map_alt=Map of the Appalachian Development Highway System
|map_notes=Map of the Appalachian Development Highway System
|formed=March 9, 1965
|length_mi=3090
|length_ref=
|maint=[[State governments of the United States|state]] or [[Local government in the United States|local governments]]
|interstate=
|us=
|state=
|notes=
|links=
}}

[[File:Corridor X shields along future Interstate 22 in Alabama.jpg|thumb|right|ADHS signs for [[U.S. Route 78]]/[[U.S. Route 78 in Alabama|Alabama State Route 4]]/ADHS Corridor X with their distinctive blue color.  Most other states do not have distinctive highway shields for ADHS, however.]]

The '''Appalachian Development Highway System''' ('''ADHS''') is a series of highway [[Transport corridor|corridor]]s in the [[Appalachia]] region of the eastern [[United States]].  The routes are designed as local and regional routes for improving economic development in the historically isolated region.  It was established as part of the [[Appalachian Regional Development Act]] of 1965, and has been repeatedly supplemented by various federal and state legislative and regulatory actions.  The system consists of a mixture of [[State highway|state]], [[United States Numbered Highway System|U.S.]], and [[Interstate Highway System|Interstate]] routes.  The routes are formally designated as "corridors" and assigned a letter.  Signage of these corridors varies from place to place, but where signed are often done so with a distinctive blue-colored sign.

The [[Appalachian Regional Commission]] (ARC) forecast benefits of ADHS' completion by FY 2045 as the creation of 47,000 new jobs and $4.2 billion in gross regional product (GRP).<ref name="PlanMar2021" />

==History==
[[Image:1966 map of the Appalachian Development Highway System.jpg|thumb|left|1966 map]]  In 1964, the [[President of the United States|President]]'s [[Appalachian Regional Commission]] (PARC) reported to [[United States Congress|Congress]] that economic growth in [[Appalachia]] would not be possible until the region's isolation had been overcome.  Because the cost of building highways through Appalachia's mountainous terrain was high, the region's local residents had never been served by adequate roads.  The existing network of narrow, winding, two-lane roads, snaking through narrow stream valleys or over mountaintops, was slow to drive, unsafe, and in many places worn out.  The nation's [[Interstate Highway System]], though extensive through the region, was designed to serve cross-country traffic rather than local residents.<ref name="ARC.gov">{{cite web |url=https://www.arc.gov/program_areas/AppalachianDevelopmentHighwaySystem.asp |title=Appalachian Development Highway System |publisher=Appalachian Regional Commission |access-date=18 March 2024}}</ref>

The PARC report and the Appalachian governors placed top priority on a modern highway system as the key to economic development.  As a result, Congress authorized the construction of the Appalachian Development Highway System (ADHS) in the Appalachian Development Act of 1965.  The ADHS was designed to generate economic development in previously isolated areas of the 13 Appalachian states, supplement the interstate system, and provide access to areas within the region as well as to markets in the rest of the nation.<ref name="ARC.gov" /> 

The ADHS is currently authorized at {{convert|3090|mi|km}}, including {{convert|65|mi}} added in January 2004 by Public Law 108–199. A decade into construction, delays and cost increases mounted, attributed to:<ref name="ADHS-1976" />
*highway construction cost inflation
*upgraded construction guidelines following then-current [[Interstate Highway standards]]
*revised relocation assistance requirements
*delays associated with environmental protection, and 
*Federal funding limitations

Periodic ADHS Completion Plan Reports were compiled to assess construction and the remaining cost-to-complete (C-to-C) forecasts, excerpts listed below.
:{| class="wikitable"
! Date
! Open or constructing
! Forecast C-to-C
|-
|1976
|{{convert|1237|mi|km}}
|$7.9 B<ref name="ADHS-1976">{{cite web |author1=[[Elmer B. Staats]] |title=The Appalachian Development Highway System In West Virginia: Too Little Funding Too Late? |url=https://www.gao.gov/assets/psad-76-155.pdf |website=www.gao.gov |publisher= Comptroller General of The United States |access-date=18 March 2024 |date=November 3, 1976}}</ref>
|-
|1998
|{{convert|2259|mi|km}}
|$8.5 B<ref name="PlanDec1998">{{cite web |last1=Kirk |first1=Robert S. |title=Appalachian Development Highway Program(ADHP): An Overview |url=https://www.everycrsreport.com/reports/98-973.html |website=www.everycrsreport.com |publisher=Congressional Research Service |access-date=22 March 2024 |date=7 December 1998}}</ref>
|-
|2013
|{{convert|2717|mi|km}}
|$11.4 B<ref name="plansep2013" />
|-
|2021
|{{convert|2814|mi|km}}
|$10.3 B<ref name="PlanMar2021">{{cite web |title=Appalachian Development Highway System 2021 Cost-to-Complete Estimate Report |url=https://www.arc.gov/wp-content/uploads/2021/03/ADHS-2021-Cost-to-Complete-Estimate-Report-March-2021-FINAL-1.pdf |website=www.arc.gov |publisher=Appalachian Regional Commission |access-date=22 March 2024 |date=March 2021}}</ref>
|-
|2023
|{{convert|2837|mi|km}}
|$9.7 B<ref name="ARC.gov" />
|}

By FY 2023, {{convert|2837|mi}} – 91.8 percent of the authorized distance – were complete, open to traffic, or under construction.  Many of the remaining miles will be among the most expensive to build.<ref name="ARC.gov" /> The ARC (the state governors) remain involved prioritizing, sequencing remaining corridor work. By 2040, 100% of ADHS' project miles are expected to be complete and open to traffic or, at least, partially complete.<ref name="ARC.gov" />

[[Corridor Z]] across southern [[Georgia (U.S. state)|Georgia]] is not part of the official system, but has been assigned by the [[Georgia Department of Transportation]].
{{Clear}}

==Economic results==

Historically, highway investment has served as the basis for many US regional development policies and in 2008 the ADHS was deemed one of the more comprehensive programs to use the approach.<ref name="LUP-Oct2008">{{cite journal |last1=Lein |first1=James K. |last2=Day |first2=Karis L. |title=Assessing the growth-inducing impact of the Appalachian Development Highway System in southern Ohio: Did policy promote change? |journal=Land Use Policy |date=October 2008 |volume=25 |issue=4 |pages=523-532 |doi=10.1016/j.landusepol.2007.11.006 |url=https://www.sciencedirect.com/science/article/abs/pii/S0264837707000890 |access-date=28 March 2024|url-access=subscription }}</ref> To evaluate the effectiveness of such investments, [[land change modeling]] was used to compare 1976 "pre-" and 2002 "post-" highway conditions.  The study focused on Ohio's SR-32 portion of Corridor D and the 15 counties in close proximity; Adams, Athens, Brown, Clermont, Gallia, Highland, Hocking, Jackson, Meigs, Morgan, Pike, Ross, Scioto, Vinton, and Washington Counties. Using data acquired from the [[Landsat program|Landsat system]] of earth observational satellites, the comparison revealed slight, yet significant, levels of urban expansion within a {{cvt|10|km|mi|order=flip|0}} band surrounding the new highway. Beyond this band land use was more stable, indicating even minor distance increases from the highway reduced the likelihood of further development.<ref name="LUP-Oct2008" />
Detrimentally, by 2016 new business growth along the corridor was drawing consumer traffic away from adjacent towns causing revenue loss and [[unintended consequences]] for the preexisting town-centered businesses.<ref name="ENQ" />

A 2016 economic assessment of ADHS' construction found regions of Appalachia benefitting differently. Case studies found some boosting tourism income, while others increased industrial activity or commercial/retail activity. Some regions had strong economic growth while others were dormant, the effects dependent on the pre-existing nature of the corridor, its population and workforce, its economic profile and proximity to surrounding business centers or markets.<ref name="EDRG2016">{{cite web |title=Appalachian Development Highway System  Economic Analysis Study:  Synthesis of Findings to Date |url=https://www.arc.gov/wp-content/uploads/2020/06/ADHSEconomicAnalysisStudySynthesisofFindingstoDate.pdf |website=www.arc.gov |publisher=Economic Development Research Group, Inc. |access-date=27 March 2024 |location=Boston, Massachusetts |date=May 2016}}</ref> Case study excerpts from five corridors were:

*Corridor B (North Carolina and Tennessee). Though {{convert|305.5|mi|km}} in total, this case study focused on the {{convert|88|mi|km|adj=on}} segment of Corridor B completed in 2003, passing through the [[Blue Ridge Mountains]] to connect western North Carolina with northeastern Tennessee. This project enabled improved access to the [[Port of Charleston]] and new residential and commercial developments near Weaverville, North Carolina. The highway led to a direct increase of around 4,600 new jobs in the area.<ref name="EDRG2016" />

*Corridor D (Ohio & West Virginia). Its eastern {{convert|70|mi|km|adj=on}} segment was completed in 1977, connecting interstates I-77 and I-79.  This eastern segment shifted its economy from heavy industry into healthcare, education, government and education services. The highway also helped retain indigenous manufacturing activities and enabled around 1,000 new jobs.<ref name="EDRG2016" />

*Corridor E (Maryland). Completion of this link ([[Interstate 68|now part of I-68]]) enabled the region to boost its pre-existing tourism economy by drawing residents from Washington, DC and Baltimore; expand its pre-existing manufacturing and create new distribution ([[supply chain]]) activities. The highway project enabled an estimated 900 new jobs in the region.<ref name="EDRG2016" />

*Corridor Q (Kentucky and Virginia). Improved connectivity through this mountainous region increased commuting range, facilitated commercial and retail development in several communities, development of an industrial park and a small business incubator. The highway had direct impact adding around 6,250 new jobs along the corridor.<ref name="EDRG2016" />

*Corridor T (New York State). Locally known as the [[New York State Route 17|Southern Tier Expressway]] and becoming [[Interstate 86 (Pennsylvania–New York)|I-86]] in 1998, this project saw economic gains with manufacturing jobs at several industrial parks, tourism jobs at a ski resort and a casino and service jobs at a [[Call centre|call center]]. The corridor was critical in the establishment and expansion of manufacturing facilities for diesel engines, furniture and advanced ceramics – all needing interstate trucking connectivity. Over time, the highway was credited with generating over 3,200 jobs in the region.<ref name="EDRG2016" />

A 2016–2019 study reported that the cumulative ADHS construction efforts had led to economic net gains of $54 billion (approximately 0.4 percent of national income) and had boosted incomes in the Appalachian region by reducing the costs of trade.<ref>{{Cite journal|last1=Jaworski|first1=Taylor|last2=Kitchens|first2=Carl T.|date=2018-12-21|title=National Policy for Regional Development: Historical Evidence from Appalachian Highways|journal=The Review of Economics and Statistics|volume=101|issue=5|pages=777–790|doi=10.1162/rest_a_00808|s2cid=896872|issn=0034-6535|url=http://www.nber.org/papers/w22073.pdf}}</ref> The 2021 ADHS Cost-to-Complete Estimate Report reiterated previous compilations that construction investments made between 1965–2015 contributed to the annual generation of over $19.6 B additional Appalachian business sales, representing $9+ B added GRP. Usage of the ADHS was saving 231 million hours of travel time annually, equivalent to a $10.7 B savings in transportation costs and worker productivity per year.<ref name="PlanMar2021" /> The increased economic activity was helping to maintain or create over 168,000 jobs across the 13 Appalachian states. In 2021 ARC forecast that by 2045 ADHS' construction expenses would yield a return on investment (ROI) of 3.7, meaning $3.70 in benefits for every $1.00 invested in construction.<ref name="PlanMar2021" />

Employment gains credited to the ADHS were 16,270 new Appalachian jobs as of 1995; 42,190 by 2015.<ref name="EDRG2016" />

==List of ADHS corridors==

===Corridor A===
{{Infobox road small
|name=Corridor A
|state=GA
|length_mi=198.6
|length_ref=<ref name=2013Tables>{{cite web|publisher=Appalachian Regional Commission |url=http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportTables.pdf |title=Status of Completion of the ADHS by Corridor and State |date=September 30, 2013 |access-date=June 30, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140424034137/http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportTables.pdf |archive-date=April 24, 2014 }}</ref>
|established=
|location=[[Sandy Springs, Georgia|Sandy Springs, GA]] – [[Clyde, North Carolina|Clyde, NC]]
}}
'''Corridor A''' is a [[highway]] in the states of [[Georgia (U.S. state)|Georgia]] and [[North Carolina]]. It travels from [[Interstate 285 (Georgia)|Interstate&nbsp;285]] (I-285) north of [[Atlanta]] northeast of [[Interstate 40 in North Carolina|I-40]] near [[Clyde, North Carolina]]. I-40 continues east past [[Asheville, North Carolina|Asheville]], where it meets [[Interstate 26 in North Carolina|I-26]] and [[Corridor B]].

In Georgia, Corridor A travels along the [[Georgia State Route 400|State Route&nbsp;400]] (SR&nbsp;400) [[freeway]] from I-285 to the [[Georgia State Route 141|SR&nbsp;141]] [[interchange (road)|interchange]] southwest of [[Cumming, Georgia|Cumming]].<ref name=chapter3>[http://www.arc.gov/index.do?nodeId=1039 Appalachian Development Highways Economic Impact Studies] {{webarchive |url=https://web.archive.org/web/20090826220818/http://www.arc.gov/index.do?nodeId=1039 |date=August 26, 2009 }}, Chapter 3: Highway and Traffic Analysis</ref> From here to [[Nelson, Georgia|Nelson]], near the north end of [[Interstate 575|I-575]], Corridor A has not been constructed; its proposed path is near that of the cancelled [[Outer Perimeter|Northern Arc]]. It begins again with a short piece of [[Georgia State Route 372|SR&nbsp;372]], becoming [[Georgia State Route 515|SR&nbsp;515]] when it meets I-575. SR&nbsp;515 is a four-lane [[divided highway]] all the way to [[Blairsville, Georgia|Blairsville]]. From Blairsville to North Carolina, the corridor has not been built, and SR&nbsp;515 is a two-lane road.<ref>{{Google maps |url= https://www.google.com/maps/dir/blairsville/34.9890978,-83.8258924/@34.9327664,-83.9625464,12z/data=!3m1!4b1!4m9!4m8!1m5!1m1!1s0x885f1792c1599c09:0xff0477cba84f2c11!2m2!1d-83.9584456!2d34.8760734!1m0!3e0 |title= Satellite view of SR 515 from Blairsville to NC Border |access-date= 30 December 2021}}</ref>

The short [[North Carolina Highway&nbsp;69]] (NC&nbsp;69) takes Corridor A north to [[U.S. Route 64 in North Carolina|U.S. Route&nbsp;64]] (US&nbsp;64) near [[Hayesville, North Carolina|Hayesville]]. Corridor A turns east on US&nbsp;64, and after some two-lane sections, it becomes a four-lane highway.<ref>{{Google maps |url= https://www.google.com/maps/place/NC-69,+North+Carolina+28904/@35.0345703,-83.8213692,172m/data=!3m1!1e3!4m5!3m4!1s0x885f26e1cf7b7b2f:0xfe48acd6ec1273e4!8m2!3d35.0134009!4d-83.8239457?hl=en |title= Satellite view NC 69 Turning East on 64 |access-date= 30 December 2021}}</ref> Corridor A switches to [[U.S. Route 23 in North Carolina|US&nbsp;23]] near [[Franklin, North Carolina|Franklin]], and meets the east end of [[Corridor K]] near [[Sylva, North Carolina|Sylva]]. From Sylva to its end at I-40 near [[Clyde, North Carolina|Clyde]], Corridor A uses the [[Great Smoky Mountains Expressway]], which carries US&nbsp;23 most of the way and [[U.S. Route 74 in North Carolina|US&nbsp;74]] for its entire length.
{{Clear}}

====Corridor A-1====
{{Infobox road small
|name=Corridor A-1
|state=GA
|length_mi=15.8
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Cumming, Georgia|Cumming, GA]] – [[Dawsonville, Georgia|Dawsonville, GA]]
}}
'''Corridor A-1''' uses [[U.S. Route 19 in Georgia|US&nbsp;19]]/[[Georgia State Route 400|SR&nbsp;400]] from the point that Corridor A leaves it, at [[Georgia State Route 141|SR&nbsp;141]] near [[Cumming, Georgia|Cumming]], northeast to [[Georgia State Route 53|SR&nbsp;53]] near [[Bright, Georgia|Bright]]. SR&nbsp;400 continues northeast as a four-lane highway from [[Georgia State Route 53|SR&nbsp;53]] to [[Georgia State Route 60|SR&nbsp;60]] south of [[Dahlonega, Georgia|Dahlonega]]; this section was built "with APL funds as a local access road".<ref name=chapter3/>
{{Clear}}

===Corridor B===
{{Infobox road small
|name=Corridor B
|state=KY
|length_mi=305.5
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Asheville, North Carolina|Asheville, NC]] – [[Lucasville, Ohio|Lucasville, OH]]
}}
'''Corridor B''' is a [[highway]] in the states of [[North Carolina]], [[Tennessee]], [[Virginia]], [[Kentucky]], and [[Ohio]]. It generally follows [[U.S. Route 23 in North Carolina|U.S. Route&nbsp;23]] (US&nbsp;23) from [[Interstate 26 in North Carolina|Interstate&nbsp;26]] (I-26) and [[Interstate 40 in North Carolina|I-40]] near [[Asheville, North Carolina]], north to [[Corridor C]] north of [[Portsmouth, Ohio]].<ref name="ADHS Approved Corridors and Termini">{{cite web|url=http://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp |title=ADHS Approved Corridors and Termini |date=September 30, 2016 |access-date=April 26, 2017 |url-status=dead |archive-url=https://web.archive.org/web/20120305111216/http://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp |archive-date=March 5, 2012 }}</ref>

Corridor B uses [[Interstate 240 (North Carolina)|I-240]] from its south end into downtown Asheville, where it uses US&nbsp;23 (current and future [[Interstate&nbsp;26]]) to [[Kingsport, Tennessee]]. The US&nbsp;23 [[freeway]] ends at the Tennessee–Virginia state line, but US&nbsp;23 is a four-lane [[divided highway]] through Virginia and into northeastern Kentucky.<ref name="map"/>

At Greysbranch, Kentucky, Corridor B leaves [[U.S. Route 23 in Kentucky|US&nbsp;23]] to turn east on [[Kentucky Route&nbsp;10]] (KY&nbsp;10) over the two-lane [[Jesse Stuart Memorial Bridge]] into Ohio. The short [[Ohio State Route&nbsp;253]] (OH&nbsp;253) connects the bridge to [[U.S. Route 52 in Ohio|US&nbsp;52]], a freeway that takes Corridor B north to [[Wheelersburg, Ohio|Wheelersburg]]. US&nbsp;52 continues west to [[Portsmouth, Ohio|Portsmouth]], the proposed alignment of Corridor B continues north and northwest along [[Ohio State Route 823]] to US&nbsp;23 near [[Lucasville, Ohio|Lucasville]]. The part of Corridor B north of SR&nbsp;253 is also part of the [[I-73/74 North–South Corridor]].<ref name=PB>{{cite web|url=http://www.dot.state.oh.us/Divisions/InnovativeDelivery/Pages/PortsmouthDBFOM.aspx|title=Portsmouth Bypass DBFOM Procurement|access-date=October 19, 2014}}</ref>
{{Clear}}

====Corridor B-1====
{{Infobox road small
|name=Corridor B-1
|state=OH
|length_mi=18.0
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Greenup, Kentucky|Greenup, KY]] – [[Lucasville, Ohio|Lucasville, OH]]
}}
'''Corridor B-1''' travels from KY&nbsp;10 to the north end of the Portsmouth Bypass. In Kentucky, it follows US&nbsp;23 and [[U.S. Route 23 Truck (Portsmouth, Ohio)|US&nbsp;23 Truck]]; after crossing the two-lane [[Carl Perkins Bridge]] into Ohio, it uses current and planned [[Ohio State Route 852|SR&nbsp;852]]—a western bypass of Portsmouth—and US&nbsp;23. Corridors B and B-1 both end near [[Lucasville, Ohio|Lucasville]], where [[Corridor C]] continues north along US&nbsp;23 to [[Columbus, Ohio|Columbus]].<ref name=PB/>
{{Clear}}

===Corridor C===
{{Infobox road small
|name=Corridor C
|state=OH
|length_mi=71.7
|length_ref=<ref name=Status%20of%20ADHS%20corridors>{{cite web |title=Status of the Appalachian Development Highway System as of September 30, 2019 |url=https://www.arc.gov/images/programs/transp/ADHSStatusReportFY2019.pdf |publisher=Appalachian Regional Commission |access-date=March 30, 2020 |date=January 2020}}</ref>
|established=
|location=[[Lucasville, Ohio|Lucasville, OH]] – [[Columbus, Ohio|Columbus, OH]]
}}
'''Corridor C''' is a [[highway]] in the [[U.S. state]] of [[Ohio]]. It is part of [[U.S. Route 23 in Ohio|U.S. Route&nbsp;23]] (US&nbsp;23), traveling from the north end of [[Corridor B]] near [[Lucasville, Ohio|Lucasville]] north to [[Interstate 270 (Ohio)|Interstate&nbsp;270]] (I-270) south of [[Columbus, Ohio|Columbus]].<ref name="ADHS Approved Corridors and Termini"/> {{As of|2005}}, most of the road is a four-lane [[Dual carriageway|divided highway]], but there are a few gaps yet to be built.<ref name=map>{{cite map|url=http://www.arc.gov/images/programs/transp/ADHSMap9-30-2013.pdf |format=PDF |title=Appalachian Development Highway System |date=September 30, 2013 |access-date=October 19, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20141023225446/http://www.arc.gov/images/programs/transp/ADHSMap9-30-2013.pdf |archive-date=October 23, 2014 }}</ref> Corridor C is part of the [[Interstate 73|I-73]]/[[Interstate 74|I-74]] North–South Corridor.
{{Clear}}

====Corridor C-1====
{{Infobox road small
|name=Corridor C-1
|state=OH
|length_mi=27.3
|length_ref=<ref name=Status%20of%20ADHS%20corridors/>
|established=
|location=[[Jackson, Ohio|Jackson, OH]] – [[Chillicothe, Ohio|Chillicothe, OH]]
}}
'''Corridor C-1''' is a [[Connector (road)|connector]] from Corridor C near [[Chillicothe, Ohio|Chillicothe]] southeast to [[Corridor D]] near [[Jackson, Ohio]], along [[U.S. Route 35 in Ohio|US&nbsp;35]]. It has been completed as a four-lane highway.<ref name="map"/>
{{Clear}}

===Corridor D===
{{main|Corridor D}}
{{Infobox road small
|name=Corridor D
|state=WV
|length_mi=232.9
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Mount Carmel, Ohio|Mount Carmel, OH]] – [[Clarksburg, West Virginia|Clarksburg, WV]]
}}
'''Corridor D''' travels east–west from [[Interstate 275 in Ohio|Interstate&nbsp;275]] (I-275), near [[Cincinnati]], [[Ohio]], to [[Interstate 79 in West Virginia|I-79]], near [[Bridgeport, West Virginia]]. The corridor uses [[Ohio State Route&nbsp;32]] (SR-32) and [[U.S. Route&nbsp;50]] (US&nbsp;50).

Decades after its completion Corridor D has provided mixed results- beneficial infrastructure improvements, but ARC's goal for regional prosperity still unmet. Economic growth is evident in the corridor's western counties; several new hospitals, large car dealerships and several fast food restaurants were added along the highway.<ref name="N&S">{{cite news |author1=Art Smith |title=From Belpre to Cincinnati, Ohio 32 provides vital link across state |url=https://www.newsandsentinel.com/news/local-news/2017/01/from-belpre-to-cincinnati-ohio-32-provides-vital-link-across-state/ |access-date=21 March 2024 |publisher=The Parkersburg News and Sentinel |date=January 8, 2017 |location= Parkersburg, West Virginia}}</ref> The Brown County Campus of [[Southern State Community College]] opened near Mount Orab, in a region where "''there were no (previous) options for students, they had to drive an hour''".<ref name="N&S" /> The [[Mercy Health (Ohio and Kentucky)|Mercy Health]] Mount Orab Medical Center and the [[Adams County Regional Medical Center]] were built alongside SR-32.<ref name="N&S" /> In 2006 a [[Southern Ohio Medical Center]] outreach branch opened in Adams County near the SR-32 & SR-41 intersection at Peebles.<ref>{{cite web |title=Southern Ohio Medical Inc |url=https://npiprofile.com/npi/1700816774 |website=npiprofile.com |access-date=24 March 2024}}</ref> Pike County's county seat, Jackson, has a developing retail thoroughfare running between SR-32 and its historic downtown.<ref name="ENQ">{{cite web |author1=Jeremy Fugleberg |title=Ohio 32: A road of unintended consequences |url=https://www.cincinnati.com/story/news/2016/10/15/ohio-32-road-unintended-consequences/91496144/ |website=www.cincinnati.com |publisher=The Enquirer |access-date=21 March 2024 |location=Cincinnati, Ohio |date=15 October 2016}}</ref> But the corridor's anticipated regional prosperity never occurred. Counties along the corridor still have per capita median incomes below the state average and 20-35% below the national average; the gaps are not narrowing.<ref name="ENQ" />

===Corridor E===
{{Main|Interstate 68}}
{{Infobox road small
|state=MD
|name=Corridor E
|length_mi=112.9
|length_ref=<ref name=wvdotmnd>{{cite web|publisher=West Virginia Department of Transportation|author=Carol Melling|date=2003-10-31|title=I-68 Extension Now Eligible for Federal Funding|url=http://www.wvdot.com/13_news/13_news_dtl.cfm?s=456|access-date=2009-01-17|archive-url=https://web.archive.org/web/20090523140013/http://www.wvdot.com/13_news/13_news_dtl.cfm?s=456|archive-date=2009-05-23|url-status=dead}}</ref><ref name=HLR_Garrett>{{cite web|publisher=[[Maryland State Highway Administration]]|url=http://apps.roads.maryland.gov/KeepingCurrent/performTrafficStudies/dataAndStats/hwyLocationRef/2007_hlr_all/co11.pdf|title=Highway Location Reference: Garrett County|access-date=2009-01-17|year=2007}}</ref><ref name=HLR_Allegany>{{cite web|publisher=[[Maryland State Highway Administration]]|url=http://apps.roads.maryland.gov/KeepingCurrent/performTrafficStudies/dataAndStats/hwyLocationRef/2007_hlr_all/co01.pdf|title=Highway Location Reference: Allegany County|access-date=2009-01-17|year=2007}}</ref><ref name=HLR_Washington>{{cite web|publisher=[[Maryland State Highway Administration]]|url=http://apps.roads.maryland.gov/KeepingCurrent/performTrafficStudies/dataAndStats/hwyLocationRef/2007_hlr_all/co21.pdf|title=Highway Location Reference: Washington County|access-date=2009-01-17|year=2007}}</ref>
|established=1991
|location=[[Morgantown, West Virginia|Morgantown, WV]]&nbsp;–  [[Hancock, Maryland|Hancock, MD]]
}}
'''Interstate&nbsp;68''' (I-68) is a {{convert|112.6|mi|km|adj=on}} [[Interstate highway]] in the [[U.S. state]]s of [[West Virginia]] and [[Maryland]], connecting [[Interstate 79 in West Virginia|I-79]] in [[Morgantown, West Virginia|Morgantown]] to [[Interstate 70 in Maryland|I-70]] in [[Hancock, Maryland|Hancock]]. I-68 is also '''Corridor E''' of the Appalachian Development Highway System. From 1965 until the freeway's construction was completed in 1991, it was designated as '''U.S. Route&nbsp;48''' (US&nbsp;48). In Maryland, the highway is known as the '''National Freeway''', a homage to the historic [[National Road]], which I-68 parallels between [[Keysers Ridge, Maryland|Keysers Ridge]] and [[Hancock, Maryland|Hancock]]. The freeway mainly spans rural areas, and crosses numerous mountain ridges along its route. A [[Road cutting|road cut]] constructed for it through [[Sideling Hill]] exposed geological features of the mountain and has become a tourist attraction.

[[U.S. Route 219 in Maryland|US&nbsp;219]] and [[U.S. Route 220 in Maryland|US&nbsp;220]] travel [[concurrency (road)|concurrently]] with I-68 in [[Garrett County, Maryland|Garrett County]] and [[Cumberland, Maryland]], respectively, and [[U.S. Route 40 in Maryland|US&nbsp;40]] overlaps with the freeway from Keysers Ridge to the eastern end of the freeway at Hancock.

The construction of I-68 began in 1965 and lasted for about 25 years, being completed on August 2, 1991. While the road was being built, it was predicted that the completion of the road would improve the economic situation along the corridor. The two largest cities connected by the highway are Morgantown and Cumberland, both with populations of fewer than 30,000 people. Despite the fact that the freeway serves no large metropolitan areas, I-68 provides a major transportation route in western Maryland and northern West Virginia and also provides an alternative to the [[Pennsylvania Turnpike]] for westbound traffic from [[Washington, D.C.]] and [[Baltimore]].

There have been several major planned road projects that would affect the freeway's corridor, which, due to major funding issues, are unlikely to be completed. These include a plan to extend I-68 to [[Moundsville, West Virginia]], and the plan to link the [[Mon–Fayette Expressway]], a [[toll road|toll highway]] which meets I-68 east of Morgantown, to [[Pittsburgh]], [[Pennsylvania]].{{Clear}}

===Corridor F===
{{Infobox road small
|name=Corridor F
|state=KY
|length_mi=114.8
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Caryville, Tennessee|Caryville, TN]] – [[Whitesburg, Kentucky|Whitesburg, KY]]
}}
'''Corridor F''' is a [[highway]] in the [[U.S. state]]s of [[Tennessee]] and [[Kentucky]]. It travels from [[Interstate 75 in Tennessee|Interstate&nbsp;75]] (I-75) in [[Caryville, Tennessee]], northeasterly to [[Corridor B]] ([[U.S. Route 23 in Kentucky|U.S. Route&nbsp;23]] (US&nbsp;23)) near [[Kentucky]]. Corridor F uses [[U.S. Route 25W in Tennessee|US&nbsp;25W]] and [[Tennessee State Route&nbsp;63]] (SR&nbsp;63) from I-75 to [[Corridor S]] ([[U.S. Route 25E in Tennessee|US&nbsp;25E]]) in [[Harrogate, Tennessee]]. There, it turns northwest along US&nbsp;25E, passing through the [[Cumberland Gap Tunnel]] into Kentucky. It leaves [[U.S. Route 25E in Kentucky|US&nbsp;25E]] in [[Pineville, Kentucky]], turning northeasterly along [[U.S. Route 119 in Kentucky|US&nbsp;119]], past an intersection with [[Corridor I]] ([[Kentucky Route&nbsp;15]] (KY&nbsp;15)) in [[Whitesburg, Kentucky|Whitesburg]], to its end at Corridor B.
{{Clear}}

===Corridor G===
{{main|U.S. Route 119}}
{{Infobox road small
|state=KY
|name=Corridor G
|length_mi=105.1
|length_round=
|length_ref=<ref name=2013Tables/>
|established=1972
|location=[[Pikeville, Kentucky|Pikeville, KY]]&nbsp;–  [[Charleston, West Virginia|Charleston, WV]]
}}

'''Corridor G''' is a [[highway]] in the [[U.S. state]]s of [[Kentucky]] and [[West Virginia]] that follows the route of [[U.S. Route&nbsp;119]] (US&nbsp;119) from [[Pikeville, Kentucky]], to [[Charleston, West Virginia]]. Construction on the road began in 1972 in West Virginia and 1974 in Kentucky, but it was more than two decades before the road was completed in either state. The full length of Corridor G in West Virginia was completed in 1997, but Kentucky's last segment was not opened until 2008.{{Clear}}

===Corridor H===
{{Main|U.S. Route 48}}
{{Infobox road small
|state=WV
|name=Corridor H
|length_mi=146.1
|length_ref=<ref name=2013Tables/>
|established=2002
|location=[[Weston, West Virginia|Weston, WV]]&nbsp;–  [[Strasburg, Virginia|Strasburg, VA]]
}}
'''Corridor H''' is a [[highway]] in the [[U.S. state]]s of [[West Virginia]] and [[Virginia]]. It travels from [[Weston, West Virginia|Weston]], West Virginia to [[Strasburg, Virginia|Strasburg]], Virginia. In December 1999, a settlement agreement was reached, providing the framework for resumption of final design, right-of-way acquisition and construction activities on the Corridor H highway project. Corridor H is the only corridor highway that remains incomplete in the State of West Virginia. It begins at [[Interstate 79 in West Virginia|I-79]] in Weston and will end at [[Interstate 81 in Virginia|I-81]] in Strasburg when complete. Virginia's portion of Corridor H runs from the West Virginia state line to I-81 at Strasburg, Virginia. The building of Corridor H was controversial, arousing strong passions for and against. Decades of public debate and legal battles aired the essential question of whether previously isolated areas should be preserved or opened to development.<ref>{{cite book|last1=Sullivan|first1=Ken|title=The West Virginia encyclopedia|date=2006|publisher=West Virginia Humanities Council|location=Charleston|isbn=978-0977849802|edition=1st}}</ref> Despite the controversy, about 75 percent of the highway had been completed as of 2013. The highway is open from the Weston exit of I-79 to [[Kerens, West Virginia|Kerens]], [[Randolph County, WV|Randolph County]] and an additional section of the four-lane is open from the [[Grant County, WV|Grant]]-[[Tucker County, WV|Tucker]] county line to [[Wardensville, West Virginia|Wardensville]] as of July 2016.<ref>{{cite web|title=West Virginia Corridor H|url=http://wvcorridorh.com|website=wvcorridorh.com}}</ref>

===Corridor I===
{{Infobox road small
|name=Corridor I
|state=KY
|length_mi=59.9
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Winchester, Kentucky|Winchester, KY]] – [[Whitesburg, Kentucky|Whitesburg, KY]]
}}
'''Corridor I''' is a [[highway]] in the [[U.S. state]] of [[Kentucky]]. It travels from [[Interstate 64 in Kentucky|Interstate&nbsp;64]] (I-64) southeasterly along the [[Mountain Parkway]] and [[Kentucky Route&nbsp;15]] (KY&nbsp;15) to [[Corridor F]] ([[U.S. Route 119 in Kentucky|U.S. Route&nbsp;119]] (US&nbsp;119)) in [[Whitesburg, Kentucky|Whitesburg]]. Corridor I meets [[Corridor R]] (Mountain Parkway) near [[Campton, Kentucky|Campton]] and [[Hal Rogers Parkway]] and [[Kentucky Route 80|KY&nbsp;80]] in [[Hazard, Kentucky|Hazard]].{{Clear}}

===Corridor J===
{{Infobox road small
|name=Corridor J
|state=TN
|length_mi=209.6
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Chattanooga, Tennessee|Chattanooga, TN]] – [[London, Kentucky|London, KY]]
}}
'''Corridor J''' is a [[highway]] in the [[U.S. state]]s of [[Tennessee]] and [[Kentucky]]. It travels from the end of [[Interstate 24 in Tennessee|Interstate&nbsp;24]] (I-24) in [[Chattanooga, Tennessee]], north to [[Interstate 75 in Kentucky|I-75]] in [[London, Kentucky]].<ref name="ADHS Approved Corridors and Termini"/>

Corridor J uses [[U.S. Route 27 in Tennessee|U.S. Route&nbsp;27]] (US&nbsp;27) from Chattanooga north to [[Soddy-Daisy, Tennessee|Soddy-Daisy]]. There it turns northwest on [[Tennessee State Route 111|State Route&nbsp;111]] (SR&nbsp;111), eventually curving to the north via [[Dunlap, Tennessee|Dunlap]], [[Sparta, Tennessee|Sparta]], and [[Cookeville, Tennessee|Cookeville]] to [[Livingston, Tennessee|Livingston]]. Then it turns northwest on [[Tennessee State Route 52|SR&nbsp;52]] to [[Celina, Tennessee|Celina]] and northeast on [[Tennessee State Route 53|SR&nbsp;53]] to Kentucky.

Upon crossing into Kentucky, Corridor J becomes [[Kentucky Route&nbsp;61]] (KY&nbsp;61), heading north to [[Burkesville, Kentucky|Burkesville]]. There it turns east on [[Kentucky Route 90|KY&nbsp;90]], which it follows to [[Burnside, Kentucky|Burnside]]. Corridor J turns north on [[U.S. Route 27 in Kentucky|US&nbsp;27]] at Burnside, quickly turning northeast on [[Kentucky Route 914|KY&nbsp;914]] to bypass downtown [[Somerset, Kentucky|Somerset]]<ref>{{Google maps |url= https://www.google.com/maps/dir/36.9880519,-84.5981821/37.0987593,-84.62143/@37.0434591,-84.68321,12z/data=!3m1!4b1!4m2!4m1!3e0 |title= Map from Burnside to Somerset |access-date= 30 December 2021}}</ref> and then east on [[Kentucky Route 80|KY&nbsp;80]] to [[London, Kentucky|London]].

Listed in a US House of Representatives Report in 2002, was a proposed feasibility and the planning study to establish [[Interstate 175 (Kentucky-Tennessee)|I-175]] along Corridor J. However, no allocation of monies was appropriated and no additional discussion has been made since for this briefly proposed interstate along the corridor.<ref>{{cite web|url=http://thomas.loc.gov/cgi-bin/cpquery/z?cp107:hr108:|title=House Rpt. 107-108: Department of Transportation and Related Agencies Appropriations Bill|date=May 2, 2002|publisher=Library of Congress|access-date=October 5, 2014|archive-date=January 17, 2009|archive-url=https://web.archive.org/web/20090117150631/http://thomas.loc.gov/cgi-bin/cpquery/z?cp107:hr108:|url-status=dead}}</ref><ref>{{cite web|url=http://thomas.loc.gov/cgi-bin/cpquery/R?cp107:FLD010:@1(hr308):|title=Committee Reports|publisher=Library of Congress|access-date=October 5, 2014|archive-date=October 3, 2014|archive-url=https://web.archive.org/web/20141003122707/http://thomas.loc.gov/cgi-bin/cpquery/R?cp107:FLD010:@1(hr308):|url-status=dead}}</ref>

Until late 2005, Corridor J was to turn west just north of Cookeville along the planned [[Tennessee State Route 451|SR&nbsp;451]] to [[Tennessee State Route 56|SR&nbsp;56]] north of [[Baxter, Tennessee|Baxter]] and then use SR&nbsp;56 and SR&nbsp;53 via [[Gainesboro, Tennessee|Gainesboro]].<ref>[http://users.multipro.com/mldoutt/ Stop Corridor J (SR451)] {{webarchive |url=https://web.archive.org/web/20070927135649/http://users.multipro.com/mldoutt/ |date=September 27, 2007 }}</ref><ref>[http://www.tdot.state.tn.us/corridorj/ Tennessee Department of Transportation, Appalachian Development Highway System Corridor J] {{webarchive |url=https://web.archive.org/web/20070821052024/http://www.tdot.state.tn.us/corridorj/ |date=August 21, 2007 }}</ref>{{Clear}}

====Corridor J-1====
{{Infobox road small
|name=Corridor J-1
|state=TN
|length_mi=22.9
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Algood, Tennessee|Algood, TN]] – [[Celina, Tennessee|Celina, TN]]
}}
'''Corridor J-1''' runs from [[Algood, Tennessee|Algood]] west to [[Tennessee State Route 56|SR&nbsp;56]], then north to [[Celina, Tennessee|Celina]] via [[Tennessee State Route 53|SR&nbsp;53]] and [[Gainesboro, Tennessee|Gainesboro]]; it is proposed that the part of the corridor be renumbered as [[Tennessee State Route 451|SR&nbsp;451]].  The corridor serves as an alternate route for Corridor J, avoiding [[Livingston, Tennessee|Livingston]]. The entire route is two-lane with wide shoulders, allowing for possible expansion if needed.<ref name=ARC-TN/>
{{Clear}}

===Corridor K===
{{see also|Great Smoky Mountains Expressway}}
{{Infobox road small
|name=Corridor K
|state=NC
|length_mi=127.7
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Cleveland, Tennessee|Cleveland, TN]] – [[Dillsboro, North Carolina|Dillsboro, NC]]
}}
'''Corridor K''' is a [[highway]] in the [[U.S. state]]s of [[Tennessee]] and [[North Carolina]].  Overlapped entirely by [[U.S. Route 74]] (US&nbsp;74), it also has shorter concurrences with [[U.S. Route 19 in North Carolina|US&nbsp;19]], [[U.S. Route 64|US&nbsp;64]], [[APD-40]] (US&nbsp;64 Bypass), [[U.S. Route 129 in North Carolina|US&nbsp;129]] and [[U.S. Route 441 in North Carolina|US&nbsp;441]].  The corridor connects [[Interstate 75 in Tennessee|Interstate&nbsp;75]] (I-75) in [[Cleveland, Tennessee]] (northeast of [[Chattanooga, Tennessee|Chattanooga]]), easterly to [[Corridor A]] ([[U.S. Route 23 in North Carolina|US&nbsp;23]]) near [[Dillsboro, North Carolina]].<ref name="ADHS Approved Corridors and Termini"/><ref name=ARC-TN/><ref name=ARC-NC/>

[[File:US19-US74-US129-Murphy.jpg|thumb|left|[[U.S. Route 19 in North Carolina|US&nbsp;19]]/[[U.S. Route 74 in North Carolina|US&nbsp;74]]/[[U.S. Route 129 in North Carolina|US&nbsp;129]] (Appalachian&nbsp;Highway), in [[Murphy, North Carolina|Murphy]]]]

There are two gaps in the corridor, one in each state.  The {{convert|20.1|mi|km|adj=on}} gap in Tennessee is the [[Ocoee Scenic Byway]] along the [[Ocoee River]] from Parksville to [[Ducktown, Tennessee|Ducktown]].  Plans outline a new alternate route for this section since the current route does not meet the purpose and need to support the regional transportation goals of a safe, reliable and efficient east–west route.  Currently in environmental study, a record of decision is expected in 2017.<ref>{{cite web |publisher= Tennessee Department of Transportation |url= http://www.tdot.state.tn.us/corridork/ |title= US 64 / Corridor K Project |access-date= October 20, 2014}}</ref><ref>{{cite web |publisher= Tennessee Department of Transportation |url= http://www.tdot.state.tn.us/corridork/docs/CorridorK_ProjectFactSheet.pdf |title= Corridor K Project Fact Sheet |access-date= October 20, 2014}}</ref>  The {{convert|27.1|mi|km|adj=on}} gap in North Carolina is located from [[Andrews, North Carolina|Andrews]] to [[Stecoah, North Carolina|Stecoah]].  Broken in three projects, the plan outlines a new four-lane [[Limited-access road|expressway]] that will bypass north of the [[Nantahala Gorge]] and connect [[Robbinsville, North Carolina|Robbinsville]].  At a total cost to NCDOT estimated at $443 million, it is currently in reprioritization.<ref>{{cite web |publisher= North Carolina Department of Transportation |url= https://connect.ncdot.gov/projects/planning/STIResults/H090001-A.pdf |title= SPOT ID: H090001-A |date= September 23, 2014 |access-date= October 20, 2014}}</ref><ref>{{cite web |publisher= North Carolina Department of Transportation |url= https://connect.ncdot.gov/projects/planning/STIResults/H090001-B.pdf |title= SPOT ID: H090001-B |date= September 23, 2014 |access-date= October 20, 2014}}</ref><ref>{{cite web |publisher= North Carolina Department of Transportation |url= https://connect.ncdot.gov/projects/planning/STIResults/H090001-C.pdf |title= SPOT ID: H090001-C |date= September 23, 2014 |access-date= October 20, 2014}}</ref>

Since the corridor's establishment, the first major improvement for the corridor happened in 1979, when bypasses were completed for [[Murphy, North Carolina|Murphy]] and [[Andrews, North Carolina|Andrews]].<ref>{{AASHTO minutes |year=1979S |page=3}}</ref>  In 1986, US&nbsp;74 was extended west from [[Asheville, North Carolina|Asheville]], overlapping all of Corridor K.<ref>{{AASHTO minutes |year=1986S |page=3}}</ref>  Its last major improvement was in 2005, with the widening of [[North Carolina Highway 28|NC&nbsp;28]] at Stecoah, and the first completed section of the Nantahala Gorge bypass.  Now at 74.8% of the corridor completed, it features four-lane divided highway predominantly expressway grade, with sections in and around [[Cleveland, Tennessee|Cleveland]], [[Cherokee, North Carolina|Cherokee]] and [[Dillsboro, North Carolina|Dillsboro]] at [[Controlled-access highway|freeway grade]].  The corridor also connects the cities of [[Ducktown, Tennessee|Ducktown]] and [[Bryson City, North Carolina|Bryson City]], and features the [[Ocoee Scenic Byway|Ocoee National Forest Scenic Byway]], in Tennessee, and the Nantahala Byway, in North Carolina; treating travelers with grand vistas and various recreational activities.{{Clear}}

===Corridor L===
{{Infobox road small
|name=Corridor L
|state=WV
|length_mi=68.8
|length_ref=<ref name=2013Tables/>
|length_round=
|established=
|location=[[Beckley, West Virginia|Beckley, WV]] – [[Sutton, West Virginia|Sutton, WV]]
}}

'''Corridor L''' is a [[highway]] in the [[U.S. state]] of [[West Virginia]]. It follows the path of [[U.S. Route 19 in West Virginia|U.S. Route&nbsp;19]] (US&nbsp;19) between [[Beckley, West Virginia|Beckley]] and [[Sutton, West Virginia|Sutton]]. By exiting onto Corridor L from [[Interstate 79 in West Virginia|Interstate&nbsp;79]] (I-79) at milepost 57, a southbound traveler can eliminate {{Convert|40|mi|km}}, and $7.75 in tolls, re-entering the interstate system at the [[West Virginia Turnpike]] ([[Interstate 64 in West Virginia|I-64]] and [[Interstate 77 in West Virginia|I-77]]) at milepost 48.

Originally, this corridor was built as a four-lane [[divided highway]] for only the portion south of [[U.S. Route 60 in West Virginia|US&nbsp;60]]; however, the large amount of traffic (as part of the direct route from the cities of [[Toronto]], [[Buffalo, New York|Buffalo]], and [[Pittsburgh]] to [[Florida]] and a considerable portion of the Atlantic southeast) forced the state to rethink this plan and upgrade the northern half to four lanes as well.<ref>{{cite web|last1=Kozel|first1=Scott M.|title=New River Gorge Bridge (US-19 Corridor "L")|url=http://www.roadstothefuture.com/New_River_Gorge_Br.html|website=Roads to the Future|access-date=September 18, 2016}}</ref>
{{Clear}}

===Corridor M===
{{Infobox road small
|name=Corridor M
|state=PA
|length_mi=170.2
|length_ref=<ref name=2013Tables/>
|length_round=
|established=
|location= [[New Stanton, Pennsylvania|New Stanton, PA]]&nbsp;–  [[Harrisburg, Pennsylvania|Harrisburg, PA]]
}}
'''Corridor M''' is a [[highway]] in the [[U.S. state]] of [[Pennsylvania]].  It follows [[Pennsylvania Route 66]] from [[Interstate 76 (Ohio–New Jersey)|Interstate 76]] near [[New Stanton, Pennsylvania|New Stanton]] to an intersection near [[Delmont, Pennsylvania|Delmont]], where it follows [[U.S. Route 22 in Pennsylvania|U.S. Route 22]] until the [[Interstate 81 in Pennsylvania|Interstate 81]] interchange near [[Harrisburg, Pennsylvania|Harrisburg]].  A large portion near the center of the route has not yet been upgraded to a four-lane divided highway.<ref>{{Cite web|date=November 2017|title=Southern Alleghenies Rural Planning Organization: 2041 Long Range Transportation Plan|url=https://sapdc.org/wp-content/uploads/simple-file-list/LRTP-Documents/Southern_Alleghenies_RPO_2017-2041_LRTP.pdf#page=36|url-status=live|access-date=2021-09-09|website=Southern Alleghenies Planning and Development Commission|page=28|archive-url=https://web.archive.org/web/20210910011304/https://sapdc.org/wp-content/uploads/simple-file-list/LRTP-Documents/Southern_Alleghenies_RPO_2017-2041_LRTP.pdf |archive-date=2021-09-10 }}</ref><ref>{{Cite web|date=December 2020|title=Status of the Appalachian Development Highway System as of September 30, 2020|url=https://www.arc.gov/wp-content/uploads/2020/12/ADHSStatusReportFY2020.pdf#page=45|url-status=live|access-date=2021-09-09|website=Appalachian Regional Commission|page=PA-2|archive-url=https://web.archive.org/web/20210125170545/https://www.arc.gov/wp-content/uploads/2020/12/ADHSStatusReportFY2020.pdf |archive-date=2021-01-25 }}</ref>

Projects currently under way in Pennsylvania include:<ref>{{cite web|url=http://www.arc.gov/images/programs/transp/adhs_status_report_2009/ADHSFY2009StatusReportPennsylvania.pdf |title=Appalachian Development Highway System (ADHS) Pennsylvania Corridors |date=September 30, 2009 |access-date=October 19, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20101005175824/http://www.arc.gov/images/programs/transp/adhs_status_report_2009/ADHSFY2009StatusReportPennsylvania.pdf |archive-date=October 5, 2010 }}</ref>
* A location study on a {{convert|59.8|mi|adj=on}} section to provide four lanes between [[Hollidaysburg, Pennsylvania|Hollidaysburg]] and [[Lewistown, Pennsylvania|Lewistown]]{{Clear}}

===Corridor N===
{{Infobox road small
|name=Corridor N
|state=PA
|length_mi=54.4
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Grantsville, Maryland|Grantsville, MD]] – [[Ebensburg, Pennsylvania|Ebensburg, PA]]
}}
'''Corridor N''' is a [[highway]] in the [[U.S. state]]s of [[Maryland]] and [[Pennsylvania]]. It is a designated portion of [[U.S. Route&nbsp;219]] (US&nbsp;219), traveling from [[Corridor E]] ([[Interstate 68 in Maryland|I-68]]/[[U.S. Route 40 in Maryland|US&nbsp;40]]) near [[Grantsville, Maryland]], north to [[Corridor M]] ([[U.S. Route 22 in Pennsylvania|US&nbsp;22]] near [[Ebensburg, Pennsylvania]]). There is currently an attempt in the [[U.S. House of Representatives]] to extend this corridor, in the form of House bill H.R.1544 - Corridor N Extension Act of 2011. The act would extend Corridor N north from its current terminus at Corridor M to [[Corridor T]] in southwestern [[New York (state)|New York]]. The bill has not yet been brought before Congress for debate. As of January 2019, Corridor N has been completed as a [[controlled-access highway]] from just north of Ebensburg to [[Meyersdale, Pennsylvania|Meyersdale]]. In late 2021 Maryland opened a {{convert|1.2|mi|km|adj=on}} four-lane bypass of the prior US 219 at the Corridor E (I-68) interchange; the remainder of the route to Meyersdale remains a two-lane highway.{{Clear}}

===Corridor O===
{{Main articles|U.S. Route 220 in Maryland|U.S. Route 220 in Pennsylvania|Interstate 99}}
{{Infobox road small
|name=Corridor O
|state=PA
|length_mi=87.1
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Cumberland, Maryland|Cumberland, MD]] – [[Bellefonte, Pennsylvania|Bellefonte, PA]]
}}
'''Corridor O''' is a [[highway]] in the [[U.S. state]]s of [[Maryland]] and [[Pennsylvania]]. It is part of [[U.S. Route&nbsp;220]] (US&nbsp;220), traveling from Corridor E, near [[Cumberland, Maryland]], north to [[Interstate 80 in Pennsylvania|I-80]], near [[Bellefonte, Pennsylvania]]. The part north of the [[Pennsylvania Turnpike]] ([[Interstate 70 in Pennsylvania|I-70]]/[[Interstate 76 in Pennsylvania|I-76]]) near [[Bedford, Pennsylvania|Bedford]] is also [[Interstate 99|I-99]].{{Clear}}

====Corridor O-1====
{{Infobox road small
|name=Corridor O-1
|state=PA
|length_mi=14.2
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Port Matilda, Pennsylvania|Port Matilda, PA]] – [[Clearfield, Pennsylvania|Clearfield, PA]]
}}
'''Corridor O-1''' begins at Corridor O at [[Port Matilda, Pennsylvania]], and travels northwesterly along [[U.S. Route 322 in Pennsylvania|US&nbsp;322]] to [[Interstate 80 in Pennsylvania|I-80]] near [[Clearfield, Pennsylvania|Clearfield]].{{Clear}}

===Corridor P===
{{Infobox road small
|name=Corridor P
|state=PA
|length_mi=59.5
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Mackeyville, Pennsylvania|Mackeyville, PA]] – [[Milton, Pennsylvania|Milton, PA]]
}}
'''Corridor P''' is a [[highway]] in the [[U.S. state]] of [[Pennsylvania]]. It travels from a point near [[Mackeyville, Pennsylvania|Mackeyville]], eastward to [[Milton, Pennsylvania|Milton]], via [[Williamsport, Pennsylvania|Williamsport]].<ref name="ADHS Approved Corridors and Termini"/>{{Clear}}

====Corridor P-1====
{{see also|Central Susquehanna Valley Thruway}}
{{Infobox road small
|name=Corridor P-1
|state=PA
|length_mi=51.01
|location=[[Duncannon, Pennsylvania|Duncannon, PA]] – [[Milton, Pennsylvania|Milton, PA]]
}}

'''Corridor P-1''' begins at [[#Corridor M|Corridor M]] ([[U.S. Route 22 in Pennsylvania|US&nbsp;22]]/[[U.S. Route 322 in Pennsylvania|US&nbsp;322]]) near [[Duncannon, Pennsylvania|Duncannon]] and travels north for {{convert|51.01|mi|km}} along [[U.S. Route 11 in Pennsylvania|US&nbsp;11]]/[[U.S. Route 15 in Pennsylvania|US&nbsp;15]] and [[Pennsylvania Route 147|PA&nbsp;147]], meeting [[#Corridor P|Corridor P]] at the interchange of [[Interstate 80 in Pennsylvania|Interstate 80]] and [[Interstate 180 (Pennsylvania)|I-180]] near [[Milton, Pennsylvania|Milton]].<ref name="P-1">[https://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp ADHS Approved Corridors and Termini]</ref>

The majority of the corridor's length from its southern terminus to [[Selinsgrove, Pennsylvania|Selinsgrove]] is a four-lane divided highway carrying the US&nbsp;11 and US&nbsp;15 designations. The northernmost {{convert|3.79|mi|km}} of this section is a freeway bypassing Selinsgrove. The next {{convert|10.84|mi|km}} is an unbuilt freeway named the [[Central Susquehanna Valley Thruway]] (CSVT), which will partially be designated US&nbsp;15 and PA&nbsp;147. Construction began on the northern {{convert|4.49|mi|km|adj=on}} half of the CSVT in 2016. The remaining {{convert|7.49|mi|km}} of Corridor P-1 from the CSVT to I-80 and Corridor P is a four-lane freeway section of PA&nbsp;147.

{{Clear}}

===Corridor Q===
{{main|Corridor Q}}
{{Infobox road small
|name=Corridor Q
|state=WV
|length_mi=163.6
|length_ref=<ref name="2013Tables"/>
|established=
|location=[[Pikeville, Kentucky|Pikeville, KY]] – [[Christiansburg, Virginia|Christiansburg, VA]]
}}
'''Corridor Q''' is a [[highway]] in the [[U.S. state]]s of [[Kentucky]], [[Virginia]], and [[West Virginia]]. It travels from [[U.S. Route 23 in Kentucky|US&nbsp;23]]/[[U.S. Route 119 in Kentucky|US&nbsp;119]], near [[Pikeville, Kentucky]], to [[Interstate 81 in Virginia|Interstate&nbsp;81]], in [[Christiansburg, Virginia]]. In the 2013 fiscal year, the corridor is 82.2% completed.<ref name=2013Tables/>
{{Clear}}

===Corridor R===
{{Infobox road small
|name=Corridor R
|state=KY
|length_mi=50.7
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Campton, Kentucky|Campton, KY]] – [[Prestonsburg, Kentucky|Prestonsburg, KY]]
}}
'''Corridor R''' is a [[highway]] in the [[U.S. state]] of [[Kentucky]]. It travels from [[Corridor I]] at the [[Interchange (road)|interchange]] of the [[Mountain Parkway]] and [[Kentucky Route&nbsp;15]] (KY&nbsp;15) near [[Campton, Kentucky|Campton]] east along the Mountain Parkway and [[Kentucky Route 114|KY&nbsp;114]] to [[Corridor B]] ([[U.S. Route 23 in Kentucky|US&nbsp;23]]/[[U.S. Route 460 in Kentucky|US&nbsp;460]]) in [[Prestonsburg, Kentucky|Prestonsburg]].<ref name="ADHS Approved Corridors and Termini"/> It forms part of a route from [[Lexington, Kentucky]] to [[Roanoke, Virginia]] using [[Interstate 64 in Kentucky|Interstate&nbsp;64]] (I-64), [[Corridor I]], Corridor R, [[Corridor B]], [[Corridor Q]], and [[Interstate 81 in Virginia|I-81]].<ref>{{cite web|publisher=Appalachian Regional Commission |url=http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportKentucky.pdf |title=Status of Corridors in Kentucky |date=September 30, 2013 |access-date=June 30, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140705024349/http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportKentucky.pdf |archive-date=July 5, 2014 }}</ref>
{{Clear}}

===Corridor S===
{{Infobox road small
|name=Corridor S
|state=TN
|length_mi=48.7
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Morristown, Tennessee|Morristown, TN]] – [[Cumberland Gap, Tennessee|Cumberland Gap, TN]]
}}
'''Corridor S''' is a [[highway]] in the [[U.S. state]] of [[Tennessee]]. It is routed entirely along [[U.S. Route 25E in Tennessee|U.S. Route&nbsp;25E]] (US&nbsp;25E); from [[Interstate 81 in Tennessee|Interstate&nbsp;81]] (I-81), near [[Morristown, Tennessee|Morristown]], to [[Tennessee State Route 63|State Route&nbsp;63]] (SR&nbsp;63; Corridor F), in [[Harrogate, Tennessee|Harrogate]]. In the 2013 fiscal year, {{convert|26.5|mi|km}} has been completed, while {{convert|22.2|mi|km}} remains to be constructed, which consists of [[rest area]]s and design and construction of [[Interchange (road)|interchanges]] to meet interstate standards.<ref name="plansep2013">{{cite web |title=APPALACHIAN DEVELOPMENT HIGHWAY SYSTEM COMPLETION PLAN REPORT |url=https://www.arc.gov/wp-content/uploads/2020/07/ADHSCompletionPlanReport-9-2013.pdf |website=[[Appalachian Regional Commission]] |access-date=December 13, 2020 |date=September 2013}}</ref><ref name=ARC-TN>{{cite web|publisher=Appalachian Regional Commission |url=http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportTennessee.pdf |title=Status of Corridors in Tennessee |date=September 30, 2013 |access-date=June 30, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140705024500/http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportTennessee.pdf |archive-date=July 5, 2014 }}</ref>
{{Clear}}

===Corridor T===
{{Main|Interstate 86 (Pennsylvania–New York)}}
{{Infobox road small
|name=Corridor T
|state=NY
|length_mi=220.3
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Erie, Pennsylvania|Erie, PA]] – [[Binghamton, New York|Binghamton, NY]]
}}
'''Corridor T''' is a [[highway]] in the [[U.S. state]]s of [[Pennsylvania]] and [[New York (state)|New York]]. It travels from [[Greenfield Township, Erie County, Pennsylvania|Greenfield Township, Pennsylvania]] (northeast of [[Erie, Pennsylvania|Erie]]) to [[Windsor (village), New York|Windsor, New York]], and corresponds to '''Interstate&nbsp;86''', an upgrade of the existing [[New York State Route&nbsp;17]] (NY&nbsp;17). An [[U.S. Route 219#Southern Expressway Extension|extension of the US&nbsp;219 Southern Expressway]] will also join I-86.

Known as the '''Southern Tier Expressway''' and '''Quickway''' (split by [[Interstate 81 in New York|Interstate&nbsp;81]] (I-81) at [[Binghamton, New York]]), I-86 will connect [[Interstate 90 in Pennsylvania|I-90]] northeast of Erie, with [[Interstate 87 (New York)|I-87]] (the [[New York State Thruway]]) near [[Harriman, New York]]. As of August 2008, it travels east from I-90 to [[New York State Route 352|NY&nbsp;352]] in [[Elmira, New York|Elmira]], bringing the total length of highway designated as I-86 to {{convert|200|mi|0}} (and {{convert|181|mi|km}} remaining to be designated).<ref name="NYSDOT">{{cite press release|url=https://www.dot.ny.gov/news/press-releases/2006/111 |title=State Route 17 Becomes Interstate 86 From Kirkwood (Exit 75) To Windsor (Exit 79) (Broome County) |date=October 11, 2006 |publisher=New York State Department of Transportation |access-date=September 13, 2007 |url-status=dead |archive-url=https://web.archive.org/web/20121002082744/https://www.dot.ny.gov/news/press-releases/2006/111 |archive-date=October 2, 2012 }}</ref> Once completed, I-86 will stretch 388 miles (624&nbsp;km) across the [[Southern Tier of New York]] from I-90 to I-87,<ref name="mapquest">[[MapQuest]] driving directions: [http://www.mapquest.com/directions/main.adp?do=nw&2n=Broome%20County&1y=US&r=f&mo=ma&1si=gaz&2s=NY&2c=Port%20Dickinson&2si=gaz&1da=%2d1%2e000000&1rc=A5XAX&2da=%2d1%2e000000&2rc=A5XAX&1n=Erie%20County&cl=EN&2v=CITY&did=1150755750&1gi=0&qq=1ADqpk24ofCW2E%252blbNiuKRuLR92XSgNUG1%252fnf9u9zgJPBwyfKONwHBc%252b%252fjNI3l6WJWezh8UXdHLTTYf8miGUPQqioiTNufIHiLj8iuY%252fR4AsHir%252b11272g%253d%253d&2gi=0&2y=US&un=m&1s=PA&1c=Erie&go=1&rsres=1&1v=CITY&ct=NA&1l=KNtC3noK8AQ=&1g=7DGUbnVFgv0=&2l=HGgpx5ce7ug=&2g=feWK7NRqDa4= part 1] and [http://www.mapquest.com/directions/main.adp?do=nw&2n=Rockland%20County&1y=US&r=f&mo=ma&2s=NY&1si=gaz&2c=Suffern&2si=gaz&1rc=A5XAX&2rc=A5XAX&cl=EN&1n=Broome%20County&2v=CITY&did=1150755912&qq=IEaKSvfsRsq5g4lrcIFMtMCZ%252bbHeRawU04pqD6fBZFrUXbhgh0RdJtqNb98RbIBNR6FCYJ8YMn%252fmwLXvA6w4O34C3dyQn4QzcMa3cMM4Iyvi1fCurfl4KB6dTF1qAOU65uX01ZdQzetqrg6EnGbwCQFGj3bwHeggZIhadGSwGhaIm7jGHB63MYvbUFlYzd6olieqt55266Sq1UeFl3FY4JzGUke8KlEOwljVB8V7rWY6ARIDDBkmVvJg90%252f6emxGDO0gj4bTUFV%252f%252fyr9ThCDZ0Q24Z6mODHvRskpiwmNoPRowNtbzn1kxf0387wzi6lPvUSsxVCCDW7snHcRrqAa%252bk9hp8npt3LeHfEY%252blcbA9n3Bt7KKcHCMg%253d%253d&2y=US&un=m&1s=NY&1c=Port%20Dickinson&go=1&rsres=1&1v=CITY&ct=NA&1l=HGgpx5ce7ug=&1g=feWK7NRqDa4=&2l=ihh8h31RRUw=&2g=rLgQaMqA+Gk= part 2]</ref> shorter than the {{convert|460|mi|0}} along the  [[New York State Thruway]] to the north.<!--451.1 mi in NY from http://www.nysthruway.gov/tolls/calc/trip.cgi and about 9 in PA from the exit number-->

Several sections of NY&nbsp;17 are not up to [[freeway]] or [[Interstate Highway standards]], and need to be upgraded before I-86 can be designated along its full length. These substandard sections are located near [[Elmira, New York|Elmira]], Binghamton, and the [[Catskill Mountains]].

I-86 currently travels {{convert|6.99|mi}}<ref name="FHWA log">{{cite web|url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/?redirect|title=Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002|publisher=[[Federal Highway Administration]]|access-date=October 20, 2014}}</ref> in [[Pennsylvania]] and {{convert|190|mi|0}} in [[New York (state)|New York]].<ref name="mapquest"/> Except for a section of about {{convert|1.5|mi}} that dips into Pennsylvania near [[Waverly, Tioga County, New York|Waverly, New York]] but is maintained by the [[New York State Department of Transportation]], the rest of I-86 will be in New York.
{{Clear}}

===Corridor U===
{{Infobox road small
|name=Corridor U
|state=PA
|length_mi=53.7
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Williamsport, Pennsylvania|Williamsport, PA]] – [[Elmira, New York|Elmira, NY]]
}}
'''Corridor U''' is a [[highway]] in the [[U.S. state]]s of [[Pennsylvania]] and [[New York (state)|New York]]. It begins at Corridor P ([[U.S. Route 220 in Pennsylvania|U.S. Route&nbsp;220]] (US&nbsp;220)) near [[Williamsport, Pennsylvania]], and proceeds generally northward to Corridor T ([[Interstate 86 (Pennsylvania–New York)|Interstate&nbsp;86]] (I-86)) in [[Elmira, New York]]. The corridor follows [[U.S. Route 15 in Pennsylvania|US&nbsp;15]] northward from Williamsport to [[Tioga Junction, Pennsylvania|Tioga Junction]], where it turns northeastward to follow [[Pennsylvania Route&nbsp;328]] (PA&nbsp;328), [[New York State Route&nbsp;328]] (NY&nbsp;328), and [[New York State Route&nbsp;14]] (NY&nbsp;14) through Elmira to I-86.<ref name="ADHS Approved Corridors and Termini"/>

The portion along US&nbsp;15 in Pennsylvania is slated to become [[Interstate 99]].
{{Clear}}

====Corridor U-1====
{{Infobox road small
|name=Corridor U-1
|state=NY
|length_mi=9.4
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Tioga, Pennsylvania|Tioga, PA]] – [[Corning, New York|Corning, NY]]
}}
'''Corridor U-1''' is a [[Spur route|spur]] from Corridor U at [[Tioga, Pennsylvania]], continuing north along [[Interstate 99|I-99]]/[[U.S. Route 15|US&nbsp;15]] to [[Corning, New York]], where it connects with Corridor T ([[Interstate 86 (Pennsylvania–New York)|I-86]]). Only the portion in New York is signed as I-99; the portion in Pennsylvania is slated to become I-99 but is currently only signed as US&nbsp;15.
{{Clear}}

===Corridor V===
{{Infobox road small
|name=Corridor V
|state=AL
|length_mi=247.6
|length_ref=<ref name=2013Tables/>
|established=
|location=[[Batesville, Mississippi|Batesville, MS]] – [[Kimball, Tennessee|Kimball, TN]]
}}
'''Corridor V''' is a [[highway]] in the [[U.S. state]]s of [[Mississippi]], [[Alabama]], and [[Tennessee]]. Its termini are [[Interstate 55 in Mississippi|Interstate&nbsp;55]] (I-55) in [[Batesville, Mississippi]], and [[Interstate 24 in Tennessee|I-24]] west of [[Chattanooga, Tennessee]].

[[Image:Corridor V US 72.JPG|thumb|left|upright|Sign for Corridor V and [[U.S. Route 72 in Alabama|US&nbsp;72]] in Alabama]]
As of late 2014, the following portions of Corridor V have been recently completed or are underway:
* Between [[Red Bay, Alabama]],  and [[Fulton, Mississippi]] (designated [[Mississippi Highway&nbsp;76]] (MS&nbsp;76)) which was completed on April 11, 2023<ref name="ms76completed1">{{cite news |last1=Carlisle |first1=Zac |title=Highway 76 extension opens Tuesday morning in Itawamba County |url=https://www.wtva.com/news/highway-76-extension-opens-tuesday-morning-in-itawamba-county/article_d9bb6f54-d7e9-11ed-a2e4-131e3e87eb77.html |access-date=April 14, 2023 |work=[[WTVA]] and [[WLOV-TV]] |publisher=[[Entertainment Studios]] and Coastal Television Broadcasting Company LLC |date=April 10, 2023}}</ref><ref name="ms76completed2">{{cite news |last1=Reed |first1=Winston |title=New stretch of highway opens in Itawamba County |url=https://www.wcbi.com/new-stretch-of-highway-opens-in-itawamba-county/ |access-date=April 11, 2023 |work=[[WCBI-TV]] |publisher=[[Morris Multimedia]] |date=April 11, 2023}}</ref>
* Relocated [[U.S. Route 278 in Mississippi|US&nbsp;278]]/[[Mississippi Highway 6|MS&nbsp;6]] between [[Tupelo, Mississippi|Tupelo]] and [[Pontotoc, Mississippi]], which was opened in July 2014

A widening project is also underway on [[Alabama State Route&nbsp;24]] (SR 24) between [[Red Bay, Alabama|Red Bay]] and [[Russellville, Alabama|Russellville]], as this section of Corridor V was previously reconstructed as an improved two-lane route within divided a four-lane right-of-way.

Corridor V between Batesville and Fulton was also designated as [[National Highway System (United States)|National Highway System]] '''[[Intermodal Surface Transportation Efficiency Act#High Priority Corridors|High Priority Corridor]] 42''' and a [[Future Interstate Highways|Future Interstate Corridor]] as part of the 1998 [[Transportation Equity Act for the 21st Century]]; originally, Corridor 42 also included a concurrency with [[Interstate 22|Corridor X]] between Fulton and [[Birmingham, Alabama]], but this concurrency was removed in subsequent legislation.<ref>Federal Highway Administration, [http://www.fhwa.dot.gov/hep10/nhs/hipricorridors/hpcfi.htm "NHS High Priority Corridors designated as Future Interstates"] {{webarchive |url=https://web.archive.org/web/20080305202404/http://www.fhwa.dot.gov/hep10/nhs/hipricorridors/hpcfi.htm |date=March 5, 2008 }}, retrieved 16 September 2007</ref><ref>Federal Highway Administration, [https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/?redirect "FHWA Route Log and Finder List"], retrieved 16 September 2007</ref> However, the portion of the route between Batesville and Tupelo was only constructed to four-lane divided highway standards, making Interstate highway designation unlikely in the near future.

Corridor V was also designated as '''High Priority Corridor 11''' in the [[National Highway System Designation Act]] of 1995.<ref name="V">''Appalachian Regional Commission'' (September 30, 2004). [http://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp "ARC|ADHS Approved Corridors and Termini"] {{webarchive|url=https://web.archive.org/web/20120305111216/http://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp |date=2012-03-05 }}. Retrieved 28 July 2005.</ref>
{{Clear}}

===Corridor W===
{{Infobox road small
|name=Corridor W
|state=SC
|length_mi=30.4
|length_ref=<ref name=2013Tables/>
|established=
|location= [[Greenville, South Carolina|Greenville, SC]] – [[East Flat Rock, North Carolina|East Flat Rock, NC]]
}}
'''Corridor W''' is a [[highway]] in the [[U.S. state]]s of [[South Carolina]] and [[North Carolina]]. It is routed entirely along [[U.S. Route&nbsp;25]] (US&nbsp;25); from [[Interstate 85 in South Carolina|Interstate&nbsp;85]] (I-85), in [[Greenville, South Carolina]], to [[Interstate 26 in North Carolina|I-26]], near [[East Flat Rock, North Carolina]].  The entire corridor is four-lane, that is [[Limited-access road|expressway grade]] in South Carolina and [[Controlled-access highway|freeway grade]] in North Carolina.  Of the entire {{convert|39.4|mi|km|adj=on}} route, only {{convert|30.4|mi|km}} was authorized for ADHS funding. In the 2013 fiscal year, both states completed their sections of Corridor W; South Carolina also became the first state to complete its entire ADHS miles of any of the 13 Appalachian states.<ref name=ARC-NC>{{cite web|publisher=Appalachian Regional Commission |url=http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportNorthCarolina.pdf |title=Status of Corridors in North Carolina |date=September 30, 2013 |access-date=June 29, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20150203234735/http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportNorthCarolina.pdf |archive-date=February 3, 2015 }}</ref><ref>{{cite web |publisher= Appalachian Regional Commission |url= http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportSouthCarolina.pdf |title= Status of Corridors in South Carolina |date= September 30, 2013 |access-date= June 29, 2014}}</ref>
{{Clear}}

===Corridor X===
{{Main|Interstate 22}}
{{Infobox road small
|country = USA
|type = I
|route = 22
|name=Corridor X
| length_mi = 202.22
| length_ref = <ref name="fhwa">{{cite web |last = Starks |first = Edward |date = January 27, 2022 |title = Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways |url = https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table01.cfm |access-date = March 10, 2023 |work = FHWA Route Log and Finder List |publisher = [[Federal Highway Administration]] }}</ref>
|established=
|location= [[Fulton, Mississippi|Fulton, MS]] – [[Birmingham, Alabama|Birmingham, AL]]
}}
'''Corridor X''' is a [[highway]] in the [[U.S. state]]s of [[Mississippi]] and [[Alabama]]. It travels from [[Fulton, Mississippi]], to [[Interstate 65 in Alabama|Interstate 65]], in [[Birmingham, Alabama]]. It was officially designated as I-22 on November 12, 2012.<ref name=Alabama>{{cite web|publisher=Appalachian Regional Commission |url=http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportAlabama.pdf |title=Status of Corridors in Alabama |date=September 30, 2013 |access-date=July 1, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140705024314/http://www.arc.gov/noindex/programs/transp/adhs_status_report_2013/ADHSFY2013StatusReportAlabama.pdf |archive-date=July 5, 2014 }}</ref>
{{Clear}}

====Corridor X-1====
{{main|Birmingham Northern Beltline}}
{{infobox road small
|state=AL
|type=Future
|route=422
|name=Corridor X-1
|length_mi=52.5
|location=[[Bessemer, Alabama|Bessemer]]–[[Argo, Alabama]]
|header_type=UC
}}
'''Corridor X-1''' or the '''Birmingham Northern Beltline''' (which will be signed as I-422) is a proposed {{convert|65|mi|km|adj=on}} northern [[Bypass (road)|bypass]] around [[Birmingham, Alabama]]. Beginning at [[Interstate 20 in Alabama|I-20]]/[[Interstate 59 in Alabama|I-59]]/[[U.S. Route 11 in Alabama|US-11]] and [[Interstate 459|I-459]], south of [[Bessemer, Alabama]], it will travel northwest connecting [[U.S. Route 78 in Alabama|US 78]], [[Interstate 22 in Alabama|I-22]] (indirectly via [[Interstate 222|I-222]]), [[Interstate 65 in Alabama|I-65]], and [[U.S. Route 31 in Alabama|US 31]] then ending at I-59 north of I-459. Funding issues and pushback from environmental activists have stalled the project for decades with only a short, unused segment being constructed in the mid-2010s.<ref>{{cite news |last1=Blakely |first1=Will |title=U.S. Rep. Palmer: Northern Beltline 'critical' for Alabama; Says I-65… |url=https://1819news.com/news/item/u-s-rep-palmer-northern-beltline-critical-for-alabama-says-i-65-should-be-widened-but-not-top-priority |access-date=25 August 2023 |work=1819 News |date=24 August 2023}}</ref>
{{Clear}}

==See also==
* [[Georgia State Route 520]], which is called '''Corridor Z'''
* [[Appalachian Trail]] (Appalachian National Scenic Trail in the eastern U.S.)
* [[Appalachian Trail Conservancy]] (formerly the Appalachian Trail Conference)

==References==
{{Reflist}}

==External links==
*[https://web.archive.org/web/20100913032801/http://www.arc.gov/program_areas/MapoftheADHS.asp current map of the ADHS].
*[https://web.archive.org/web/20120305111216/http://www.arc.gov/program_areas/ADHSApprovedCorridorsandTermini.asp ADHS Approved Corridors and Termini]
*[https://web.archive.org/web/20060924224730/http://www.arc.gov/index.do?nodeId=1083 Cross-Reference of ADHS Corridors to State/U.S. Highways as of 3/13/98]
*[https://web.archive.org/web/20050529012259/http://www.aaroads.com/arc/ AARoads - Appalachian Regional Commission Development Corridors]
*[https://www.eadhs.org/background/ Interactive Maps (GIS) for ADHS (homepage)]
*[https://app.eadhs.org/cost-to-complete/map/map.html Interactive Cost-to-complete Map]
*[http://206.212.1.195/adhs2014/ ADHS Information Management System] 

[[Category:Appalachian Development Highway System| ]]
[[Category:Highways in the United States]]