Dwight D. Eisenhower National System of Interstate and Defense Highways | |
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System information | |
Formed | June 29, 1956 [1] |
Highway names | |
Interstates | Interstate X (I-X) |
System links | |
In the United States, future Interstate Highways include proposals to establish new mainline (one- and two-digit) routes to the Interstate Highway System. Included in this article are auxiliary Interstate Highways (designated by three-digit numbers) in varying stages of planning and construction, and the planned expansion of existing primary Interstate Highways.
Several Congressional High Priority Corridors have been designated as future parts of the Interstate Highway System by the Intermodal Surface Transportation Efficiency Act and amendments. By law, they will become interstates when built to Interstate standards and connected to other interstates. [2] [3]
Location | Savannah, GA – Knoxville, TN |
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Interstate 3 is the proposed designation of an Interstate Highway Corridor under development in the Southeastern United States. It is planned to run from Savannah, Georgia, to Knoxville, Tennessee. 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. 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. The "Interstate 3" designation has not been officially accepted by American Association of State Highway and Transportation Officials (AASHTO) or the Federal Highway Administration (FHWA), but is being used by the Georgia Department of Transportation 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. [4] [5]
Location | Wheeler Ridge–Sacramento, CA |
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Interstate 7 or 9 has been proposed by Caltrans for State Route 99 in central California. It would go from the split with I-5 at Wheeler Ridge (Wheeler Ridge Interchange) north through Bakersfield and Fresno 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 junction in Sacramento, where the future Interstate(s), after continuing north from Stockton along Route 99, can turn west along the Capital City Freeway, 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. [6] The route is to remain roughly parallel 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 54, the California Farm-to-Market Corridor; this legislation also designated that corridor as a future segment of the Interstate System. [7]
Location | Noble County, OK to Springdale, AR |
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Length | 190 mi (310 km) |
On May 20, 2021, Senator Jim Inhofe, of Oklahoma, introduced legislation to designate the portion of US 412 between I-35 in Noble County and I-49 in Springdale, Arkansas as future Interstate 42 (I-42). [8] [9] The bill, titled the "Future Interstate in Oklahoma and Arkansas Act" (S. 1766), was cosponsored by senators John Boozman and Tom Cotton, 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 of Tulsa, and the heads of both ODOT and the Arkansas Department of Transportation (ArDOT). [10] The language of the bill was later included in the Infrastructure Investment and Jobs Act (H.R. 3684). Interstate 42 (I-42) was the proposed designation but was withdrawn. [11] 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. [12]
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Interstate 67 has been a proposed number for at least three highways.
Indiana has proposed using the I-67 designation for the freeway upgrade of US 31 currently under construction between Indianapolis and South Bend, possibly continuing northward via the US 31 freeway to Benton Harbor, Michigan, and going northward from there along existing I-196 to Grand Rapids. The Indiana Senate unanimously passed a resolution calling for federal funding for this proposal and the I-67 designation in 2003. [13] 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).
I-67 was originally the designation given to a never-built highway connecting Kalamazoo, Michigan, to the east side of Elkhart, Indiana, as part of the original Interstate numbering plan in 1957. [14] A planning map shows a freeway along this routing intersecting the Indiana Toll Road just west of the State Road 19 interchange. [15] The Michigan State Highway Department 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. [16] The I-67 designation was denied by the American Association of State Highway and Transportation Officials which then assigned I-196 to the Benton Harbor to Grand Rapids route, west of the I-96 junction near Grand Rapids. [17]
A third, much shorter, proposal in 2011 by the I-67 Development Corporation from the Owensboro, Kentucky, area involves continuing the proposed I-67 in Indiana along a route parallel to US 231 from Crane, Indiana, to Bowling Green, Kentucky. Much of the proposed route already exists and is close to Interstate grade. Only the northern third from Dale, Indiana, to Crane remains unfinished. It would use the Natcher Bridge to cross the Ohio River, 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 and Huntingburg in Indiana as well as Owensboro, Hartford, and Morgantown, Kentucky, 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. [18]
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As originally proposed by the Michigan State Highway Department in 1957, I-94 from Benton Harbor to Detroit would have been numbered Interstate 92. Since then, I-92 has been a proposed number for at least two highways.
Low population and natural barriers like the White Mountains have impeded economic development in northern New England. In the early 1970s, Maine, New Hampshire, Vermont and New York proposed two new Interstate Highway corridors:
The Federal Highway Administration ultimately did not approve these plans.
Northern New England is served by three north–south freeways radiating from Boston and by Interstate 91, which follows the Connecticut River. However, the northernmost complete east–west freeway in the region, Interstate 90 in Massachusetts, does not enter northern New England. East–west travel through northern New England is facilitated by three freeway segments:
Maine Senator Olympia Snowe said in 2004 that the region is disadvantaged by the fact that it was the only region in the US for which a federal High Priority Corridor was not designated in the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA). [19] In 2012, the east–west highway was again proposed, this time as a privately financed toll road. [20]
Current backers of the highway propose an east–west axis through northern and central Maine, with three potential freeway links with Canada—two from Québec, and one from New Brunswick. One portion of the new highway would run from Interstate 395 in Brewer, Maine, to the Canadian border near Calais, with a direct link to New Brunswick Route 1, a major transportation corridor serving the Maritimes. A second would travel northwest from Interstate 95 near Waterville, Maine, to the Canadian border at Coburn Gore, with a connection to a proposed extension of Quebec Autoroute 10 toward Montreal. A third would travel due west from I-95 near Waterville, following the U.S. Route 2 corridor through Maine, New Hampshire, Vermont, and northern New York, with Quebec's Autoroute 73 having a southeasterly oriented southern end that heads for the Armstrong-Jackman Border Crossing, as Quebec Route 173 already reaches the United States at the same port of entry.[ citation needed ]
Location | Watertown, NY – Swanton, VT |
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As originally proposed by the Michigan State Highway Department in 1958, I-696 would have been numbered Interstate 98. [16] Since then, another highway in Upstate New York and Vermont has been linked to the number. Plans for the Rooftop Highway, a proposed limited-access highway that would extend for 175 miles (282 km) from Watertown, New York, to Swanton, Vermont, which I-89 travels through (at exit 21), first surfaced in the 1950s. If built, the highway would likely follow the US 11 corridor across the northern part of New York's North Country, connecting I-81 to I-89.[ citation needed ]
A study called the North Country Transportation Study Action Plan and Final Technical Report suggests that the road would likely be built to Interstate Highway standards due to a lack of infrastructure throughout the area. Backers of the project have called for the highway to be designated as I-98; [21] however, this designation has not been recognized by any government agencies, such as NYSDOT or the AASHTO. The number does fit into AASHTO's numbering system, though, as the highest even numbers are designated for highways running along the Canadian border, such as the proposed highway. [22]
The Northern Corridor Transportation Group (NCTG) was formed in December 2008 as a means of refocusing the fifty-year discussion on the project. Since that time, more than 100 municipal and civic resolutions from the five northern counties of New York have been passed in support of the construction of the project. On July 16, 2009, the NCTG submitted a request to U.S. Senator Kirsten Gillibrand to direct $800 million toward the project as part of the reauthorization of a federal highway transportation bill. In a historic move, the six northern legislators representing the North Country in the New York State Legislature (Senators Aubertine, Griffo and Little and Assembly Members Scozzafava, Russell and Duprey) signed an official letter of request to the same end.[ citation needed ]
Location | Wilson, NC–Christiana, DE |
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In 2006, the Virginia General Assembly directed the Secretary of Transportation to initiate a study to determine the interest of affected states in the construction of a new Interstate highway (I-99). [23] [24] [25] I-99 would allow long-distance travelers to bypass the I-95 bottleneck in the Baltimore–Washington metropolitan area. This would be separate from the existing Interstate 99 in New York and Pennsylvania, and unlike the current route, would fall into its place on the numbering grid.
I-99 would travel from I-95 in Wilson, North Carolina, to another point on I-95 in Christiana, Delaware (12 miles (19 km) from Wilmington, Delaware). It would renumber the controlled access Delaware Route 1 and would parallel (or utilize an upgraded version of) U.S. Route 13 (US 13) through the Delmarva Peninsula and use the existing Chesapeake Bay Bridge–Tunnel. It would travel through Norfolk, Virginia, traveling concurrently with existing interstates where possible. I-99 would continue to travel parallel to US 13 until it enters North Carolina (which is itself in the process of being upgraded to an Interstate), where it would travel parallel to US 258 until ending on I-95 in Wilson. [24]
Another option is for I-99 to parallel (or utilize upgraded versions of) US 17 in North Carolina, and have it end in Charleston, South Carolina (or Pocotaligo, South Carolina where it could rejoin I-95). Much of US 17 is a four-lane divided highway, but only short sections are currently freeway standard. One option that was never fully planned was to connect the proposed Christiana, Delaware, I-99 east coast section and the existing Bedford, Pennsylvania, I-99 section by having I-99 travel concurrently with existing interstates including I-476 and I-76. [24]
Location | Union City to Martin |
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Length | 15.00 mi (24.14 km) |
Interstate 169 is proposed to run along Tennessee State Route 22 from Union City to Martin. [26]
Future Interstate 195 | |
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Location | Washington |
Length | 2.41 mi (3.88 km) |
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Future Interstate 214 | |
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Location | Bryan–College Station |
This interstate is proposed to be a beltway around Bryan-College Station in Texas. [27]
Location | Graysville to Brookside |
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Length | 2.26 mi (3.64 km) |
Interstate 222 (I-222) is a future auxiliary Interstate Highway that will be a connector between I-22 and the proposed I-422 near Birmingham, Alabama. There will be no exits other than its termini. The highway has been proposed because an interchange directly between I-22 and I-422 cannot be built due to environmental issues. [28]
Location | Winston-Salem |
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Length | 16.83 mi (27.09 km) |
Interstate 274 (I-274) is the future designation for the western half of the beltway, currently designated as NC 452. When completed, it will connect US 158, near Clemmons, North Carolina, to Future I-74/Future I-285/US 52, in Bethania. I-274 first appeared on North Carolina Department of Transportation (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 (AASHTO) approved a request to establish Future I-274. Justification given by NCDOT was that the 16.83-mile (27.09 km) section would satisfy a great need to alleviate congestion in Winston-Salem and connect the western portion of the urbanized area. [29]
Location | Gulfport |
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Length | 6.00 mi (9.66 km) |
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. [30]
Location | Park City to Somerset |
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Length | 88.376 mi (142.227 km) |
Interstate 365 is a proposed redesignation of the Cumberland Parkway 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. [31] The designation would need approval from AASHTO, the FHWA, and upgrades of several interchanges and other improvements before the designation could be implemented.
Location | Henderson to Owensboro |
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Length | 24.441 mi (39.334 km) |
Interstate 369 is planned to follow the entire Audubon Parkway with the Western terminus to Interstate 69 being called Interstate 69 Spur. [32]
Location | Akron to Macedonia |
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Length | 17.57 mi (28.28 km) |
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. [33]
Location | south of Bessemer to Argo |
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Length | 52.5 mi (84.5 km) |
Interstate 422 is a proposed beltway in Birmingham. 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. [34]
Location | Franklin Park to Des Plaines |
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Length | 6.00 mi (9.66 km) |
Existed | 2025–present |
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; it will run along the west side of O'Hare International Airport. The tollway will connect I-294 (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 (Jane Addams Memorial Tollway). It is proposed to be finished by 2025. [35]
Location | Nortonville to Beaver Dam |
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Length | 38.446 mi (61.873 km) |
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. [36]
Location | Montgomery |
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Length | 14.440 mi (23.239 km) |
This Interstate is planned to follow a portion of Interstate 95 when Interstate 95 gets altered on the Montgomery Outer Loop. [37]
Location | Greensboro to Dunn |
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Length | 89.200 mi (143.553 km) |
Interstate 685 is a proposed Interstate planned to run along current US 421. It will be upgraded to Interstate highway standards from Interstate 40 in Greensboro to Interstate 95 in Dunn. [38]
Location | St. Johns to Jacksonville |
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Length | 5.508 mi (8.864 km) |
Florida State Road 9B is planned to be redesignated Interstate 795 (I-795) when the designation is approved by the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO). [39]
Location | San Diego to Otay Mesa |
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Length | 8.96 mi (14.42 km) |
Interstate 905 in California is proposed to replace California State Route 905, which connects San Diego to the Mexican border. [40]
Interstate 99 (I-99) is an Interstate Highway in the United States with two segments: one located in central Pennsylvania and the other in northern Pennsylvania into southern New York along US 15. The southern terminus of the route is near exit 146 of the Pennsylvania Turnpike (I-70/I-76) north of Bedford, where the road continues south as U.S. Route 220 (US 220). The northern terminus of the Pennsylvania segment is at an at-grade intersection with Musser Lane near I-80 near Bellefonte. The northern segment is entirely concurrent with US 15, beginning at I-180 in Williamsport northward into New York to an interchange with I-86 in Corning. Within Pennsylvania, I-99 passes through Altoona and State College—the latter home to the Pennsylvania State University—and is entirely concurrent with US 220.
Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of eight unconnected segments. The longest segment runs from Evansville, Indiana, northeast to the Canadian border in Port Huron, Michigan, and includes the original continuous segment from Indianapolis, Indiana, to Port Huron of 355.8 miles (572.6 km). The remaining separated segments are variously completed and posted or not posted sections of an extension southwest to the Mexican border in Texas. Of this extension—nicknamed the NAFTA Superhighway because it would help trade with Canada and Mexico spurred by the North American Free Trade Agreement (NAFTA)—seven pieces in Laredo, Texas; Pharr, Texas; Brownsville, Texas; Corpus Christi, Texas; Houston, Texas; northwestern Mississippi; and Memphis, Tennessee, have been built or upgraded and signposted as I-69. Indiana completed the fifth segment that extends I-69 through that state in August 2024.
Interstate 72 (I-72) is an Interstate Highway in the Midwestern United States. Its western terminus is in Hannibal, Missouri, at an intersection with U.S. Route 61 (US 61); its eastern terminus is at Country Fair Drive in Champaign, Illinois. The route runs through the major cities of Decatur, Illinois, and Springfield, Illinois. In 2006, the Illinois General Assembly dedicated all of I-72 as Purple Heart Memorial Highway. The stretch between Springfield and Decatur is also called Penny Severns Memorial Expressway, and the section between mile 35 and the Mississippi River is known as the Free Frank McWorter Historic Highway.
Interstate 515 (I-515) was a 20.54-mile-long (33.06 km) spur route of I-15 in the US state of Nevada that ran from the junction of I-15, US 93 and US 95 in Downtown approximately 20 miles (32 km) southeast to just north of Railroad Pass in southeastern Henderson. The freeway connected traffic headed from Boulder City and Henderson to Downtown Las Vegas via a direct, high-speed route, and it ran concurrently with, US 93, and US 95 along its entire length.
Interstate 296 (I-296) is a part of the Interstate Highway System in the US state of Michigan. It is a north–south state trunkline highway that runs for 3.43 miles (5.52 km) entirely within the Grand Rapids area. Its termini are I-196 near downtown Grand Rapids and I-96 on the north side of Grand Rapids in Walker. For most of its length, the Interstate runs concurrently with U.S. Highway 131 (US 131), which continues as a freeway built to Interstate Highway standards north and south of the shorter I-296. The highway was first proposed in the late 1950s and opened in December 1962, but the Michigan Department of Transportation (MDOT) has since eliminated all signage for I-296 and removed the designation from their official state map. The designation is therefore unsigned, but still listed on the Interstate Highway System route log maintained by the Federal Highway Administration (FHWA).
Interstate 22 (I-22) is a 202.22-mile-long (325.44 km) Interstate Highway in the US states of Mississippi and Alabama, connecting I-269 near Byhalia, Mississippi, to I-65 near Birmingham, Alabama. I-22 is also Corridor X of the Appalachian Development Highway System (ADHS). Designated in 2012, I-22 follows the route of older U.S. Route 78 (US 78) and is concurrent with the route for all but its eastern most 11 miles (18 km). The freeway mainly spans rural areas and passes numerous small towns along its route, including Fulton, Tupelo, New Albany, and Holly Springs in Mississippi and Jasper, Winfield, and Hamilton in Alabama.
Interstate 265 (I-265) is a 41.71-mile (67.13 km) Interstate Highway partially encircling the Louisville metropolitan area. Starting from I-65 in the southern part of Louisville, it runs through Jefferson County, Kentucky, crosses the Ohio River on the Lewis and Clark Bridge into Indiana, meets I-65 for a second time, and then proceeds westbound to terminate at the I-64 interchange.
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 (US 190). The portion of the route that has been constructed and signed to date, the Central Texas Corridor along US 190 west of I-35 was officially designated as I-14 by the Fixing America's Surface Transportation Act, signed by President Barack Obama on December 14, 2015.
Interstate 41 (I-41) is a 175.00-mile-long (281.64 km) north–south Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located about a mile (1.6 km) south of the Wisconsin–Illinois border at the end of the Tri-State Tollway in metropolitan Chicago, to an interchange with I-43 in metropolitan Green Bay, Wisconsin. The designation travels concurrently with US 41 for its entire length, as well as portions of I-894, US 45, I-43, and sections of I-94 in Wisconsin and Illinois. The route was officially added to the Interstate Highway System on April 7, 2015, and connects Milwaukee and Green Bay with the Fox Cities.
Interstate 80 Business, called the Capital City Freeway in its entirety and also known as Business 80, is a business loop of Interstate 80 (I-80) through Sacramento, California, United States. The route is also colloquially referred to as "Cap City Freeway" and "Biz 80". The entire route is a freeway.
Interstate 66 (I-66) is a canceled Interstate Highway designated in the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991 as the East–West TransAmerica Corridor and High Priority Corridor 3.
Interstate 69 (I-69) is an Interstate Highway that is in the process of being built in the U.S. state of Texas. It is part of a longer I-69 extension known as the NAFTA superhighway, that, when completed, will connect Canada to Mexico. In Texas, it will connect Tenaha and the Louisiana segment of the route through the eastern part of the state and along the Texas Gulf Coast to Victoria, where it will split into three branches: I-69E to Brownsville, I-69C to Pharr, and I-69W to Laredo. The first segment of I-69 in Texas was opened in 2011 near Corpus Christi. The American Association of State Highway and Transportation Officials (AASHTO) approved an additional 58 miles (93 km) of U.S. Highway 77 (US 77) from Brownsville to the Willacy–Kenedy county line for designation as I-69, which was to be signed as I-69E upon concurrence from the Federal Highway Administration (FHWA). FHWA approval for this segment was announced on May 29, 2013. By March 2015, a 74.9-mile (120.5 km) section of US 59 had been completed and designated as I-69 through Greater Houston. As of 2024, short segments near the southern terminuses of the three branch routes have also all been completed. These branches are planned to be connected to the rest of Interstate 69.
Interstate 795 (I-795) is a 25.49-mile (41.02 km) auxiliary Interstate Highway in the US state of North Carolina. It connects the city of Goldsboro to I-95 just south of Wilson, paralleling the northern portion of US Route 117 (US 117). The road runs a five-mile (8.0 km) concurrency with US 264 and I-587 in the last section of the route. It serves as a primary freeway spur for the city of Goldsboro to the Interstate Highway System, as well part of a major cargo route for the cities of Down East, which was a part of the impetus for its designation in 2007. Future plans call for the interstate to be further extended southward to meet I-40 near Faison.
Interstate 781 (I-781) is an auxiliary Interstate Highway north of Watertown in Jefferson County, New York. The route extends for 4.3 miles (6.9 km) from an interchange with I-81 in Pamelia to the main entrance of Fort Drum in Le Ray. It also has one intermediate interchange with US Route 11 (US 11) just west of Fort Drum. I-781 is four lanes wide and serves as the principal travel corridor into and out of the post. The freeway is ceremoniously designated as the Paul Cerjan Memorial Highway in honor of Paul G. Cerjan, a late US Army lieutenant general who oversaw a $1.2-billion expansion of Fort Drum in the 1980s.
Interstate 87 (I-87) is a partially completed Interstate Highway in the US state of North Carolina, the shortest designated primary Interstate Highway at 12.90 miles (20.76 km) long. The completed portion is in eastern Wake County, between Raleigh and Wendell; the majority of the completed route is known as the Knightdale Bypass, while the remaining three miles (4.8 km) follows the Raleigh Beltline (I-440). It is planned to continue northeast through Rocky Mount, Williamston, and Elizabeth City, ending in Norfolk, Virginia. It is signed as north–south, in keeping with the sign convention for most odd-numbered interstates, but the route goes primarily east–west, with the eastern direction aligning to the north designation. The entire route is concurrent with U.S Highway 64 (US 64), with portions also concurrent with I-440 and US 264. The highway is not contiguous with I-87 in New York.
Interstate 69E (I-69E) is a north–south Interstate Highway running through South Texas. Once complete, the freeway will begin in Brownsville and head northward before terminating near Victoria as both I-69W and I-69E merge into I-69 toward Houston. For its entire length, I-69E runs concurrently with U.S. Highway 77 (US 77). The route currently exists in two segments: a 56.894-mile (91.562 km) segment from its southern terminus in Brownsville to the Willacy–Kenedy county line and a shorter 24.106-mile (38.795 km) segment south of Corpus Christi. The route has one auxiliary Interstate route, I-169 in Brownsville.
Interstate 369 (I-369) is an incomplete north–south auxiliary Interstate Highway currently within Texarkana, Texas. Once complete, the freeway will run approximately 117 miles (188 km) through Northeast Texas beginning at an interchange with I-69 east of Tenaha and head northward to Carthage, Marshall, Jefferson, and Atlanta to its current northern terminus at I-30. For its entire length, I-369 will generally share its alignment with US 59.
Interstate 69W (I-69W) is a relatively short north–south Interstate Highway running through South Texas in the United States. The freeway begins northeast of the middle of the World Trade International Bridge in Laredo and ends at I-35. In the future, I-69W will head northeast for 180 miles (290 km) before terminating near Victoria as both I-69E and I-69W merge to form I-69. For its entire length, I-69W runs concurrently with U.S. Highway 59 (US 59).
Interstate 310 (I-310), also designated as Mississippi Highway 601 (MS 601), is a proposed auxiliary route of I-10 in Gulfport, Mississippi. It is planned to travel from US Highway 90 (US 90) near the Port of Gulfport to I-10. The route is part of the High Priority Corridor 100(B), Central Mississippi Corridor, as part of the I-14 extension project. The route is also listed as part of High Priority Corridors 93 and 94.
Interstate 587 (I-587) is a 37.07-mile (59.66 km) auxiliary Interstate Highway in the US state of North Carolina. The western terminus of the highway is at I-95, I-795, and US Highway 264 (US 264) near Wilson. The highway runs concurrently with I-795 and US 264 around the southern side of Wilson. I-795 diverges toward Goldsboro 4.4 miles (7.1 km) east of I-95. The eastern end of the US 264 overlap is located northwest of Saratoga. I-587 continues travelling east, bypassing Saratoga and Farmville to the north. The eastern terminus of I-587 is located at US 264 and North Carolina Highway 11 Bypass in western Greenville. I-587 is a spur of the North Carolina segment of I-87 which runs from Raleigh to Wendell. As of 2024, I-587 does not connect with its parent route.
Interstate designation, under the current proposal, would apply to the 260-mile (420 km) segment between the junction of State Route 99 with I-5 south of Bakersfield to I-5 in Stockton using State Route 4 as the connector to I-5. Since there is an I-99 route currently in existence in Pennsylvania, it is anticipated that should designation be granted, the Route 99 designation would become I-7 or 9 to satisfy Interstate numbering convention.
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