The United States' Interstate Highway System is still being expanded. Various plans have been proposed. This does not include the numerous auxiliary Interstate Highways that are in various stages of planning and construction; for those, see List of future auxiliary Interstate Highways.
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Several Congressional High Priority Corridors have been designated as future parts of the Interstate 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.[1][2]
| Interstate 9 | |
|---|---|
| Location: | Wheeler Ridge – Stockton, Calif. |
Interstate 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 north through Fresno to Stockton, where the proposed route turns west via the State Route 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, 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 the city of 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", which outlines improvements to that route, including capacity and physical improvements; this document posits that when and if Interstate status is conferred, the route will be designated I-7 or I-9.[3] 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.[4]
| Interstate 22 | |
|---|---|
| Location: | Memphis, Tenn. – Birmingham, Ala. |
Interstate 22 is the new number for current US 78 between Memphis, Tennessee, and Birmingham, Alabama. The actual I-22 designation was approved in January 2004 within the text of that year's federal highway authorization. Most of the freeway has been built. Signage has been installed designating it as Future Interstate 22 as of 2005[update], and it was completed in 2011, with the final interchange being built with the highways I-65 and US 31 in Birmingham by 2012. This is expected to be the largest and most expensive highway interchange in Alabama with over 14 different bridges. When complete, Birmingham will be designated as a control city for four Interstate routes (20, 22, 59 and 65).
| Interstate 41 | |
|---|---|
| Location: | Milwaukee – Green Bay, Wis. |
A yet-to-be-determined Interstate designation is being planned for assignment to portions of the present U.S. Route 41, I-894, and a portion of U.S. Route 45 between Milwaukee and Green Bay, Wisconsin. The route parallels the west shore of Lake Winnebago and the west bank of the Fox River, as part of the 2005 highway funding bill (Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users).[5]
Wisconsin Department of Transportation officials are studying what improvements need to be made to U.S. Route 41 as it is being prepared for Interstate status. Necessary upgrades must be made before any signage changes can happen, but the entire length from Milwaukee to Green Bay is expected to become Interstate. It is unknown what Interstate number will be selected and whether the existing route numbers will remain posted as concurrent routes when the Interstate signs are erected in the future.
The new Interstate route would roughly parallel Interstate 43, which runs north–south along Lake Michigan from Milwaukee to Green Bay, where the two interstates would meet. The designation extends from the Mitchell interchange in Milwaukee to Green Bay.
Proposed routes:
Proposed conversions of existing highways into Interstate Highways:
| Interstate 3 | |
|---|---|
| Location: | Savannah, Ga. – Knoxville, Tenn. |
The 3rd Infantry Division Highway was proposed in the 2005 highway funding bill (Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users) to run from Savannah, Georgia, north via Augusta, to Knoxville, Tennessee. Although the corridor has not been designated by law or any official body as a proposed Interstate, Interstate 3 is its popular name.[9] This number does not fit into the Interstate Highway numbering system, but matches the name chosen to honor the US Army Third Infantry Division.
| Interstate 11 | |
|---|---|
| Location: | Phoenix, Ariz. – Las Vegas, Nev. |
Interstate 11 is the proposed route number for an interstate connecting Phoenix to Las Vegas. This concept was first explored in the contractor-trade publication "Roads and Bridges" in June 1997; the article outlining the I-11 route and rationale was titled "Interstate 2000: Improvement for the Next Millennium", written by Wendell Cox and Jean Love. Their rationale was that the Phoenix and Las Vegas metro areas were two of the largest (and, circa 1997, growing) urban regions in adjacent states not featuring direct Interstate connection. The corridor would be approximately 285 miles in length and would most likely subsume the existing I-515 freeway facility in the Las Vegas area.[10] Plans to connect I-11 to the existing Interstate network in the Phoenix region have yet to be determined, but the most likely routing would extend west and southwest of the Phoenix metro complex via the proposed "Hassayampa" corridor. The proposed routing for I-11 is part of the Canamex high-priority corridor.[11] The projects contained within this portion of the overall Canamex corridor include the recently completed Hoover Dam Bypass project.[12][13][14][15] Note that there are not currently official plans to upgrade the highway to full freeway status between these cities, although the US 93 corridor is being presently upgraded to divided expressway status; along with a planned freeway bypass of the town of Wickenburg at the junction of US 60 and US 93.[16] For an overview of the US 60 and US 93 corridors that constitute much of the proposed I-11 route, see the Arizona entries for those highways at Rocky Mountain Roads.
In July 2009, The Regional Transportation Commission of Southern Nevada passed a resolution, coinciding with recent resolutions from the City of Las Vegas, and several Arizona transportation agencies, to support a future Interstate 11. The Boulder City bypass on US 93 will be built to interstate standards and is currently in the planning stages.[17][18]
| Interstate 14 | |
|---|---|
| Location: | Baton Rouge, La. – Augusta, Ga. or Natchez, Miss. – Augusta, Ga. |
The 14th Amendment Highway was proposed in the 2005 highway funding bill (Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users) to run from Augusta, Georgia, through Macon, Columbus, Montgomery, Meridian, Jackson, to end in Natchez, Mississippi, or Baton Rouge, Louisiana. Although the corridor has not been designated by law or any official body as a proposed Interstate, Interstate 14 is its popular name.[9] This number fits into the Interstate Highway numbering system, and matches the name chosen to honor the 14th Amendment to the US Constitution.
| Interstate 67 | |
|---|---|
| Location: | Indianapolis, Ind. – Grand Rapids, Mich. |
Interstate 67 is a proposed number for at least two highways.
The first proposal would be an upgrade of US 31 in Indiana between Indianapolis and South Bend, continuing northward via the US 31 freeway north to Benton Harbor, Michigan, and going northward from there along existing Interstate 196. The Indiana Senate unanimously passed a resolution calling for federal funding for this proposal.[19] Meanwhile Indiana is expediting the upgrade of US-31 between Indianapolis and South Bend using funds received through the 2006 Major Moves deal (see U.S. Route 31 in Indiana). Such a proposal would put I-67 in the proper place in the grid (it is the only number available for that route). This number in fact was officially proposed by the Michigan State Highway Department,[20] but denied by AASHO, to follow what became Interstate 196 in 1963 as part of the switch with Interstate 96 west of their junction near Grand Rapids.[21]
Interstate 67 was also the designation given to a never-built highway connecting Kalamazoo, Michigan, to the east side of Elkhart, Indiana, in the original Interstate numbering plan.[22] A planning map shows a freeway along this routing intersecting the Indiana Toll Road just west of the State Road 19 interchange.[23]
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Main Interstate Highways (major interstates highlighted) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 5 | 8 | 10 | 12 | 15 | 16 | 17 | 19 | 20 | 22 | 24 | 25 | 26 | 27 | 29 | 30 | |||
| 35 | 37 | 39 | 40 | 43 | 44 | 45 | 49 | 55 | 57 | 59 | 64 | 65 | 66 | 68 | 69 | ||||
| 70 | 71 | 72 | 73 | 74 | 75 | 76 (W) | 76 (E) | 77 | 78 | 79 | 80 | 81 | 82 | ||||||
| 83 | 84 (W) | 84 (E) | 85 | 86 (W) | 86 (E) | 87 | 88 (W) | 88 (E) | 89 | 90 | |||||||||
| 91 | 93 | 94 | 95 | 96 | 97 | 99 | H-1 | H-2 | H-3 | ||||||||||
| Unsigned | A-1 | A-2 | A-3 | A-4 | PRI-1 | PRI-2 | PRI-3 | ||||||||||||
| Lists | Primary | Main - Intrastate - Suffixed - Temporary - Future - Gaps | |||||||||||||||||
| Auxiliary | Main - Future - Unsigned | ||||||||||||||||||
| Other | Standards - Business - Bypassed - Tolled | ||||||||||||||||||