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In the United States, future Interstate Highways include proposals to establish new mainline (one- and two-digit) routes to the
Interstate Highway System The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Hi ...
. Included in this article are
auxiliary Interstate Highways Auxiliary may refer to: In language * Auxiliary language (disambiguation) * Auxiliary verb In military and law enforcement * Auxiliary police * Auxiliaries, civilians or quasi-military personnel who provide support of some kind to a military se ...
(designated by three-digit numbers) in varying stages of planning and construction, and the planned expansion of existing primary Interstate Highways.


Congressionally designated future Interstates

Several Congressional High Priority Corridors have been designated as future parts of the Interstate Highway System by the
Intermodal Surface Transportation Efficiency Act The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA, ) is a United States federal law that posed a major change to transportation planning and policy, as the first U.S. federal legislation on the subject in the post-Interstate H ...
and amendments. By law, they will become interstates when built to
Interstate standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway t ...
and connected to other interstates.


Interstate 3

Interstate 3 is the proposed designation of an Interstate Highway Corridor under development in the
Southeastern United States The Southeastern United States, also known as the American Southeast or simply the Southeast, is a geographical List of regions in the United States, region of the United States located in the eastern portion of the Southern United States and t ...
. It is planned to run from
Savannah, Georgia Savannah ( ) is the oldest city in the U.S. state of Georgia (U.S. state), Georgia and the county seat of Chatham County, Georgia, Chatham County. Established in 1733 on the Savannah River, the city of Savannah became the Kingdom of Great Brita ...
, to
Knoxville, Tennessee Knoxville is a city in Knox County, Tennessee, United States, and its county seat. It is located on the Tennessee River and had a population of 190,740 at the 2020 United States census. It is the largest city in the East Tennessee Grand Division ...
. Its number does not follow standard numbering conventions; under established numbering conventions, I-3 would normally run west of I-5 along the
Pacific Coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas North America Countries on the western side of North America have a Pacific coast as their western or south-western border. One of th ...
. The unnumbered Interstate was established by the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) legislation that also provided for
Interstate 14 Interstate 14 (I-14), also known as the 14th Amendment Highway, the Gulf Coast Strategic Highway, and the Central Texas Corridor, is an Interstate Highway that is currently located entirely in Central Texas, following US Highway 190 ( ...
. The "Interstate 3" designation has not been officially accepted by
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway A highway is any public or private road ...
(AASHTO) or the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
(FHWA), but is being used by the
Georgia Department of Transportation The Georgia Department of Transportation (GDOT) is the organization in charge of developing and maintaining all state and federal roadways in the U.S. state of Georgia (U.S. state), Georgia. In addition to highways, the department also has a li ...
and others to identify the highway. The number comes from the 3rd Infantry Division, which is based in Georgia. The exact route has not been finalized.


Interstate 7 or 9

Interstate 7 or 9 has been proposed by
Caltrans The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Tran ...
for State Route 99 in central
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. It would go from the split with I-5 at Wheeler Ridge (
Wheeler Ridge Interchange The Wheeler Ridge Interchange is a freeway interchange near Wheeler Ridge, California, where State Route 99 (SR 99) merges with Interstate 5 (I-5). Located approximately south of Bakersfield, it is the southernmost freeway inte ...
) north through
Bakersfield Bakersfield is a city in and the county seat of Kern County, California, United States. The city covers about near the southern end of the San Joaquin Valley, which is located in the Central Valley region. Bakersfield's population as of the ...
and
Fresno Fresno (; ) is a city in the San Joaquin Valley of California, United States. It is the county seat of Fresno County, California, Fresno County and the largest city in the greater Central Valley (California), Central Valley region. It covers a ...
to Stockton, where the proposed route(s) turns west via the SR 4 freeway to a terminus at I-5 in the central part of that city. An alternate proposed terminus is located at the I-5/ US 50/
Capital City Freeway Capital and its variations may refer to: Common uses * Capital city, a municipality of primary status ** Capital region, a metropolitan region containing the capital ** List of national capitals * Capital letter, an upper-case letter Econom ...
junction in
Sacramento Sacramento ( or ; ; ) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento and American Rivers in Northern California's Sacramento Valley, Sacramento's 2020 p ...
, where the future Interstate(s), after continuing north from Stockton along Route 99, can turn west along the
Capital City Freeway Capital and its variations may refer to: Common uses * Capital city, a municipality of primary status ** Capital region, a metropolitan region containing the capital ** List of national capitals * Capital letter, an upper-case letter Econom ...
, already an Interstate route (unsigned I-305), to connect with I-5, which extends north toward Redding. This also serves as a connector to the existing northern portion of Highway 99. The future Interstate's prospects for development to appropriate standards are tied to the Caltrans "Route 99 Corridor Enhancement Master Plan"; this document posits that when and if Interstate status is conferred, the route will be designated I-7 or I-9. The route is to remain roughly
parallel Parallel may refer to: Mathematics * Parallel (geometry), two lines in the Euclidean plane which never intersect * Parallel (operator), mathematical operation named after the composition of electrical resistance in parallel circuits Science a ...
to I-5, serving major cities in California I-5 does not, including Fresno and Bakersfield. In August 2005, with the passage of that year's SAFETEA-LU federal transportation legislation, SR 99 from Wheeler Ridge to Stockton and beyond to Sacramento was designated as
High Priority Corridor The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA, ) is a United States federal law that posed a major change to transportation planning and policy, as the first U.S. federal legislation on the subject in the post-Interstate H ...
 54, the California Farm-to-Market Corridor; this legislation also designated that corridor as a future segment of the Interstate System.


Interstate 42 (Oklahoma–Arkansas)

On May 20, 2021, Senator
Jim Inhofe James Mountain Inhofe (; ; November 17, 1934 – July 9, 2024) was an American politician who served as a United States Senate, United States senator from Oklahoma from 1994 to 2023. A member of the Republican Party (United States), Republican ...
, of Oklahoma, introduced legislation to designate the portion of US 412 between I-35 in Noble County and
I-49 Interstate 49 (I-49) is a north–south Interstate Highway with multiple segments. The original portion is entirely within Louisiana with an additional signed portion extending from I-220 in Shreveport to the Arkansas state line, three ne ...
in
Springdale, Arkansas Springdale is a city in Washington County, Arkansas, Washington and Benton County, Arkansas, Benton counties in the U.S. state of Arkansas. The city had a population of 84,161 at the 2020 census, making it the List of cities and towns in Arkan ...
as future Interstate 42 (I-42). The bill, titled the "Future Interstate in Oklahoma and Arkansas Act" (), was cosponsored by senators
John Boozman John Nichols Boozman ( ; born December 10, 1950) is an American politician and former optometrist serving as the senior United States senator from Arkansas, a seat he has held since 2011. A member of the Republican Party, he was the U.S. repre ...
and
Tom Cotton Thomas Bryant Cotton (born May 13, 1977) is an American politician and United States Army, Army veteran serving since 2015 as the Seniority in the United States Senate, junior United States Senate, United States senator from Arkansas. A memb ...
, both of Arkansas. The senators' stated reasons for seeking an Interstate designation along US 412 included encouraging economic development, expanding opportunities for employment in the region, making travel safer and shipping easier, attracting new businesses, and better connecting rural and urban communities. Other supporters of the measure include Mayor
G. T. Bynum George Theron Bynum IV (born August 28, 1977) is an American politician and lobbyist who served as the 40th mayor of Tulsa, Oklahoma, from 2016 to 2024. Bynum was first elected to the Tulsa City Council, representing the ninth district in 2008 a ...
of Tulsa, and the heads of both ODOT and the
Arkansas Department of Transportation The Arkansas Department of Transportation (ARDOT), formerly the Arkansas Highway and Transportation Department, is a government department in the U.S. state of Arkansas. Its mission is to provide a safe, efficient, aesthetically pleasing and env ...
(ArDOT). The language of the bill was later included in the
Infrastructure Investment and Jobs Act The Infrastructure Investment and Jobs Act (IIJA), also known as the Bipartisan Infrastructure Law (BIL),H.R. 3684 is a United States federal statute enacted by the 117th United States Congress and signed into law by President Joe Biden on Nov ...
(). Interstate 42 (I-42) was the proposed designation but was withdrawn. ArDOT and ODOT later resubmitted the application to the Spring 2024 meeting; AASHTO approved the route as Interstate 42, conditional on it being upgraded to
Interstate standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway t ...
.


Interstate 67

Interstate 67 has been a proposed number for at least three highways. I-67 was originally the designation given to a never-built highway connecting
Kalamazoo, Michigan Kalamazoo ( ) is a city in Kalamazoo County, Michigan, United States, and its county seat. At the 2020 United States census, 2020 census, Kalamazoo had a population of 73,598. It is the principal city of the Kalamazoo–Portage metropolitan are ...
, to the east side of
Elkhart, Indiana Elkhart ( ) is a city in Elkhart County, Indiana, United States. The population was 53,923 at the 2020 census. The city is located east of South Bend, Indiana. It is the most populous city in the Elkhart–Goshen metropolitan area, which in tu ...
, as part of the original Interstate numbering plan in 1957. A planning map shows a freeway along this routing intersecting the
Indiana Toll Road The Indiana Toll Road, officially the Indiana East–West Toll Road, is a controlled-access toll road that runs for east–west across northern Indiana from the Illinois state line to the Ohio state line. It has been advertised as the "Main ...
just west of the State Road 19 interchange. The
Michigan State Highway Department The Michigan Department of Transportation (MDOT) is a constitutional government principal department of the US state of Michigan. The primary purpose of MDOT is to maintain the Michigan Highway System, Michigan State Trunkline Highway System wh ...
officially requested switching the I-67 designation to a route from Benton Harbor to Grand Rapids in 1958, and in the process proposed the northerly extension of the original I-69 from the I-80/I-90/Indiana Toll Road to Lansing. The I-67 designation was denied by the
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway A highway is any public or private road ...
which then assigned I-196 to the Benton Harbor to Grand Rapids route, west of the
I-96 Interstate 96 (I-96) is an east–west Interstate Highway that runs for approximately entirely within the Lower Peninsula of the US state of Michigan. The western terminus is at an interchange with US Highway 31 (US 31) and B ...
junction near
Grand Rapids Grand Rapids is the largest city and county seat of Kent County, Michigan, United States. With a population of 198,917 at the 2020 United States census, 2020 census and estimated at 200,117 in 2024, Grand Rapids is the List of municipalities ...
.
Indiana Indiana ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the s ...
has proposed using the I-67 designation for the freeway upgrade of US 31 currently under construction between
Indianapolis Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...
and
South Bend South Bend is a city in St. Joseph County, Indiana, United States, and its county seat. It lies along the St. Joseph River (Lake Michigan), St. Joseph River near its southernmost bend, from which it derives its name. It is the List of cities in ...
, possibly continuing northward via the US 31 freeway to
Benton Harbor, Michigan Benton Harbor is a city in Berrien County, Michigan, Berrien County in the U.S. state of Michigan. It is 46 miles southwest of Kalamazoo, Michigan, Kalamazoo and 71 miles southwest of Grand Rapids, Michigan, Grand Rapids. According to the 2020 2 ...
, and going northward from there along existing I-196 to
Grand Rapids Grand Rapids is the largest city and county seat of Kent County, Michigan, United States. With a population of 198,917 at the 2020 United States census, 2020 census and estimated at 200,117 in 2024, Grand Rapids is the List of municipalities ...
. The Indiana Senate unanimously passed a resolution calling for federal funding for this proposal and the I-67 designation in 2003. Meanwhile, Indiana expedited the upgrading of three major sections on US 31 between Indianapolis and South Bend including the Kokomo Bypass. This was done using funds received through the 2006 Major Moves deal. Such a proposal would put I-67 in the proper place in the grid (it is the only number available for that route). A third, much shorter, proposal in 2011 by the I-67 Development Corporation from the
Owensboro, Kentucky Owensboro is a Home rule in the United States, home rule-class city in Daviess County, Kentucky, United States, of which it is also the county seat. It is the List of cities in Kentucky, fourth-most populous city in the state. Owensboro is loca ...
, area involves continuing the proposed I-67 in Indiana along a route parallel to US 231 from
Crane, Indiana Crane is a town in Perry Township, Martin County, in the U.S. state of Indiana. The population was 166 at the 2020 census. The community is adjacent to the Naval Surface Warfare Center Crane Division. History Crane was originally known as "Bur ...
, to
Bowling Green, Kentucky Bowling Green is a city in Warren County, Kentucky, United States, and its county seat. Its population was 72,294 as of the 2020 United States census, 2020 census, making it the List of cities in Kentucky, third-most populous city in the stat ...
. Much of the proposed route already exists and is close to Interstate grade. Only the northern third from
Dale, Indiana Dale is a town in Carter Township, Spencer County, in the U.S. state of Indiana. The population was 1,544 at the 2020 census. History Dale was originally called Elizabeth, and under the latter name was laid out in 1843. When a post office was ...
, to Crane remains unfinished. It would use the Natcher Bridge to cross the
Ohio River The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its river mouth, mouth on the Mississippi Riv ...
, Kentucky's I-165 and Indiana's Lincoln Parkway, an expressway facility that would need to be fully upgraded to Interstate standards. It would go around the cities of
Jasper Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to ...
and Huntingburg in Indiana as well as Owensboro,
Hartford Hartford is the List of capitals in the United States, capital city of the U.S. state of Connecticut. The city, located in Hartford County, Connecticut, Hartford County, had a population of 121,054 as of the 2020 United States census, 2020 ce ...
, and
Morgantown, Kentucky Morgantown is a list of Kentucky cities, home rule-class city in, and the seat of Butler County, Kentucky, Butler County, Kentucky, United States. The population was 2,471 at the time of the 2020 United States census, 2020 Census. History The ...
, and end at Bowling Green. It could also be linked to the first proposal by overlapping I-67 with the currently under construction I-69 from Indianapolis to Crane.


Future Auxiliary Interstate Highways


Interstate 169 (Tennessee)

Interstate 169 is proposed to run along Tennessee State Route 22 from Union City to
Martin Martin may refer to: Places Antarctica * Martin Peninsula, Marie Byrd Land * Port Martin, Adelie Land * Point Martin, South Orkney Islands Europe * Martin, Croatia, a village * Martin, Slovakia, a city * Martín del Río, Aragón, Spain * M ...
.


Interstate 195 (Washington D.C.)

The current Interstate 695 will be eliminated and be replaced with an extension of Interstate 395. The original Interstate 395 through the 3rd Street Tunnel will be renumbered as Interstate 195.


Interstate 214

Interstate 214 is proposed to be a beltway around Bryan-College Station in Texas.


Interstate 222

Interstate 222 is a future
auxiliary Interstate Highway Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System. The 323 auxiliary routes generally fall into three types: spur routes, which connect to or i ...
that will be a connector between I-22 and the proposed I-422 near
Birmingham, Alabama Birmingham ( ) is a city in the north central region of Alabama, United States. It is the county seat of Jefferson County, Alabama, Jefferson County. The population was 200,733 at the 2020 United States census, 2020 census, making it the List ...
. There will be no exits other than its termini. The highway has been proposed because an
interchange Interchange may refer to: Transport * Interchange (road), a collection of ramps, exits, and entrances between two or more highways * Interchange (freight rail), the transfer of freight cars between railroad companies * Interchange station, a rai ...
directly between I-22 and I-422 cannot be built due to environmental issues.


Interstate 274 (North Carolina)

Interstate 274 is the future designation for the western half of the beltway, currently designated as NC 452. When completed, it will connect
US 158 U.S. Route 158 (US 158) is an east–west United States highway that runs for from Mocksville to Whalebone Junction in Nags Head, and is located entirely in the state of North Carolina. It is also a critical route that connects the ci ...
, near
Clemmons, North Carolina Clemmons is a village in Forsyth County, North Carolina, Forsyth County, North Carolina, United States and a suburb of Winston-Salem, North Carolina, Winston-Salem. The population was 21,177 at the 2020 United States census, 2020 census, with an ...
, to Future I-74/ Future I-285/
US 52 U.S. Route 52 (US 52) is a major United States Numbered Highway System, U.S. Highway in the central United States, Central United States that extends from the northern to southeastern region of the United States. Contrary to most other even ...
, in Bethania. I-274 first appeared on
North Carolina Department of Transportation The North Carolina Department of Transportation (NCDOT) is responsible for building, repairing, and operating highways, bridges, and other modes of transportation, including ferries in the U.S. state of North Carolina. History The North Carolina ...
(NCDOT) planning maps in the early 2000s but was later disused for over a decade since. On May 20, 2019, the
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway A highway is any public or private road ...
(AASHTO) approved a request to establish Future I-274. Justification given by NCDOT was that the section would satisfy a great need to alleviate congestion in Winston-Salem and connect the western portion of the urbanized area.


Interstate 310 (Mississippi)

Interstate 310 is a proposed Interstate in Mississippi. Construction was supposed to begin in 2008 but never occurred. Much of the land clearing was done.


Interstate 365

Interstate 365 is a proposed redesignation of the
Cumberland Parkway The Louie B. Nunn Cumberland Expressway is a freeway in the U.S. state of Kentucky, extending from Barren County in the west to Somerset in the east. It is one of seven named highways designated in Kentucky's parkway system. Route description ...
once it is upgraded to Interstate standards. On August 5, 2021, Congress released a new infrastructure bill that proposed to designate the whole length of the Cumberland Expressway as a Future Interstate, with the designation of I-365. The designation would need approval from AASHTO, the FHWA, and upgrades of several interchanges and other improvements before the designation could be implemented.


Interstate 369 (Kentucky)

Interstate 369 is planned to follow the entire Audubon Parkway with the Western terminus to Interstate 69 being called Interstate 69 Spur.


Interstate 380 (Ohio)

Interstate 380 is proposed to start from the southern terminus of Ohio SR 8 at Akron to the intersection of I-271. The project has not been approved yet.


Interstate 422

Interstate 422 is a proposed beltway in
Birmingham Birmingham ( ) is a City status in the United Kingdom, city and metropolitan borough in the metropolitan county of West Midlands (county), West Midlands, within the wider West Midlands (region), West Midlands region, in England. It is the Lis ...
. Interstate 422 will not directly connect to I-22 so therefore a new connector known as Interstate 222 is proposed. It is also called Corridor X-1. A timeline for construction to begin has not been established.


Interstate 490 (Illinois)

Interstate 490, also known as the O'Hare West Bypass and Western O'Hare Beltway, is a six-mile (9.7 km) electronic toll highway and a beltway that is currently under construction near
Chicago, Illinois Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...
; it will run along the west side of
O'Hare International Airport Chicago O'Hare International Airport is the primary international airport serving Chicago, Illinois, United States, located on the city's Northwest Side, approximately northwest of the Chicago Loop, Loop business district. The airport is ope ...
. The tollway will connect
I-294 Interstate 294 (I-294) is a tolled auxiliary Interstate Highway in the northeastern part of the U.S. state of Illinois. Forming the southern portion of the Tri-State Tollway in Illinois, I-294 runs from South Holland at I-80/ I-94 and Illinoi ...
(Tri-State Tollway) to a western access point to the airport. From there, it will continue northward to an extension of Illinois Route 390 (IL 390, formerly known as the Elgin-O'Hare Expressway) and
I-90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...
(Jane Addams Memorial Tollway). It is proposed to be finished by 2027.


Interstate 569

In April 2019, the Western Kentucky Parkway was originally proposed as Interstate 369 before being changed Interstate 569 in December 2019 as the Audubon Parkway was proposed to be Interstate 369.


Interstate 685 (Alabama)

Interstate 685 is planned to follow a portion of Interstate 85 when I-85 gets altered on the Montgomery Outer Loop.


Interstate 685 (North Carolina)

Interstate 685 is a proposed Interstate planned to run along current
US 421 U.S. Route 421 (also U.S. Highway 421, US 421) is a diagonal northwest–southeast United States Numbered Highway in the states of North Carolina, Tennessee, Virginia, Kentucky, and Indiana. The highway runs for from Fort Fisher, North Car ...
. It will be upgraded to Interstate highway standards from
Interstate 40 Interstate 40 (I-40) is a major east–west transcontinental Interstate Highway System, Interstate Highway in the Southeastern United States, southeastern and Southwestern United States, southwestern portions of the United States. At a leng ...
in Greensboro to
Interstate 95 Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...
in Dunn.


Interstate 795 (Florida)

Florida State Road 9B is planned to be redesignated Interstate 795 (I-795) when the designation is approved by the
Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
(FHWA) and the
American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway A highway is any public or private road ...
(AASHTO).


Interstate 905

Interstate 905 in California is proposed to replace
California State Route 905 State Route 905 (SR 905), also known as the Otay Mesa Freeway, is an state highway in San Diego, in the southwestern part of the U.S. state of California. It connects I-5 and I-805 in San Ysidro to the Mexican border at Otay Mes ...
, which connects San Diego to the Mexican border.


See also

*


References


External links


Future Interstates and Potential Interstate Corridors at Interstate-Guide.com

North Carolina's New and Future Interstates at Malmeroads.net
{{DEFAULTSORT:Future Interstate Highways
Interstate Highways The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National H ...