Dwight D. Eisenhower National System of Interstate and Defense Highways
Shields for future Interstates
Proposed Interstate Highways in December 2015
System information
Formed	June 29, 1956[1]
Highway names
Interstates	Interstate X (I-X)
System links
Interstate Highway System Main Auxiliary Suffixed Business Future

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]

Future Interstate 3
Location	Savannah, GA – Knoxville, TN

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.^{[citation needed]}

Future Interstate 7
Location	Wheeler Ridge–Sacramento, CA

Interstate 7 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 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, 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.^[4] The route will remain roughly parallel to I-5, serving major cities in California I-5 doesn't, 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.^[5]

Future Interstate 42
Location	Noble County, Oklahoma to Springdale, Arkansas
Length	190 mi (310 km)

On May 20, 2021, Senator Jim Inhofe, Republican 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)^{[6] [7]} The bill, titled the "Future Interstate in Oklahoma and Arkansas Act" (S. 1766), was cosponsored by senators John Boozman and Tom Cotton, both Republicans of Arkansas. The senators' stated reasons for seeking an Interstate designation along the 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 the mayor of Tulsa, G. T. Bynum, and the heads of both ODOT and the Arkansas Department of Transportation (ArDOT).^[8] 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.^[9] 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.^[10]

Interstate 905 in California is proposed to replace California State Route 905.

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 422 is a proposed beltway in Birmingham. Interstate 422 won't directly connect to I-22 so therefore a new connector known as Interstate 222 is proposed. A timeline for construction to begin has not been established.^[11]

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 169 is proposed to run along Tennessee State Route 22 from Union City to Martin.

• U.S. Roads portal

• Future Interstates and Potential Interstate Corridors at Interstate-Guide.com
• North Carolina's New and Future Interstates at Malmeroads.net