In May 2006 the Gulf Coast Strategic Alliance, a Texas based lobbying group, announced a proposal to create a highway to link military bases in Texas to a port on the Atlantic coast, dubbed the "Gulf Coast Strategic Highway." The number they suggest for this highway is Interstate 14 and the port they chose to end the route at is Wilmington. An Interstate 14 corridor has previously been written into law (along with another corridor named Interstate 3) to run between Natchez. Mississippi and Augusta, Georgia based on a proposal originally endorsed by Republican Representative Max Burns from Georgia in 2004 (for more on the original Interstate 14 and 3 proposals see this I-14 article). Then Texas Senator Kay Bailey Hutchinson was to introduce a bill in the Senate in the next few months to garner funds for the corridor.1 Though apparently NC senators have been apprised, there has been no comment by NCDOT on this proposal which, would apparently use some of the same corridors currently planned for I-74 and proposed for I-20 (or perhaps I-30, see below).
A report issued through the Gaston County Chamber of Commerce examining ways to improve the local economy in July 2003 suggested, as part of its recommendations to improve the Cleveland County infrastructure that US 74 between I-26 and I-85 be designated a 3di interstate (an I-x26 or I-x85, the I-226 number is my own idea) once the US 74 bypass of Shelby has been completed. NCDOT has since committed to upgrading US 74 to interstate standards. Work started in July 2013 on the first of three projects to complete the US 74 Shelby Bypass and is due to be completed in March 2017.2 The preliminary list of projects to be considered for the 2018-2027 State TIP includes money for the remaining two projects plus for a project to upgrade US 74 from I-26 to Mooresboro to Interstate Standards.3
NCDOT in July 2005, at the urging of Andy Koeppel, a member of the Cape Fear Transportation Authority, said it would look into the suggestion that US 74 between I-26 and Wilmington be upgraded to an Interstate and designated Interstate 30. Koeppel, a commercial real estate agent, thinks that an interstate highway would improve commerce between Charlotte and Wilmington and be part of an important east-west national highway. I-30 would need to be routed along I-40 from its current end in Little Rock AR to I-26 in NC. I-30 would then follow current US 74 to Wilmington except around Charlotte where it would use I-485.4 There has been no word since 2005 on whether NCDOT saw any merit in this idea.
In early 2016 Congress approved a new transportation bill designating the corridor of US 64 from Raleigh to Williamston and US 17 from Williamston to Norfolk, VA as a Future Interstate. In May 2016 AASHTO assigned the designation of I-87 to this corridor. Earlier, in 2012, officials from Kinston, Greenville, Wilson and Goldsboro came together to support a proposal they called the "Quad-East Interstate Loop" as a way to encourage more commerce and business by having several highways in the area upgraded to freeways, including US 264 and US 13, and initially conceived as a continuation of Interstate 795.8,9 In April 2016, NCDOT released its list of potential projects to fund for its 2018-2027 State Transportation Improvement Project (STIP). Among those projects on the list were the upgrades to interstate standards of US 264 from the Wilson County Line to the US 264 Bypass in Greenville (US 264 between I-95 and the Wilson County line is already interstate standard) and US 13/NC 11 from the US 264 Bypass to US 64 near Bethel.3 If the remainder of US 264 between US 64 (Future I-87) near Zebulon to I-95 was also brought up to interstate standards, the entire US 264 and US 13/NC 11 highway would be a good candidate for a Loop (even-number) route of I-87. I-287 is not an official number, but makes a logical choice since it would be the first auxiliary route off of I-87 and would use an even number since meets it it's parent in two places. On September 7, 2016, NCDOT announced it would seek interstate designation for US 264 from Zebulon to Greenville, probably as an I-87 Spur Route (e.g., I-187). If approved, it would not be out of the question that a future upgrade to US 13/NC 11 could bring about this total route.11
Both the Gaston County Economic Development report listed above in 2003 and a report prepared for the Centralina Council of Governments in 2004 suggested as ways to improve the economic viability of the region that US 321 from I-85 to I-40 at Hickory be designated an interstate spur of either I-40 or I-85.2,10
The same Gaston County Economic Development report suggested as ways to improve the Gaston County Infrastructure that the Garden Parkway, a planned toll route from I-485 to US 321, be designated an I-85 spur.2 The NC Turnpike Authority which approved the route in 2010, does not seem to be interested in an Interstate designation for any of its facilities. The parkway proposal has no fallen out of favor due to its apparent cost and opposition from environmental groups.
Proposal of economic developer, Jed McMillan made to the NCDOT Board on August 3 in Greensboro. His interstate freeway (either and I-x85 or I-x95) would travel an upgraded US 421 between Greensboro and Fayetteville connecting 4 'megasites' (the Aerospace Center at the PTI Airport in Greensboro, the Greensboro-Randolph County project near Liberty, the Chatham Advanced Manufacturing site in Siler City, and the Moncure Megasite on US 1 in Chatham County). The NCDOT Board took no position on the proposal, nor did the Board Chair Mike Fox. Though he did comment that parts of US 421 would not be too hard to upgrade to an Interstate.12
Officials from Jacksonville, now the largest city in North Carolina without an interstate, along with having a military base, have proposed upgrading at least one of the routes into the city to connect to an interstate which could be either I-40 or I-795 (or Future I-42/US 70). The six routes suggested are US 258 to Kinston, NC 903 through Duplin County, NC 24 to I-40 or to I-95 Fayetteville, NC 24 and NC 11, US 17 to Wilmington, or US 17 to New Bern (US 70). The city's Transportation Advisory Committee is to meet in the spring to discuss the route options, and then presumably get into contact with NCDOT about their plans.13
Though there's no record of it being proposed to NCDOT, several people have suggested that US 421 be designated an I-40 or I-77 spur from the intersection of I-40 and US 421 west of Winston-Salem to at least I-77 if not further west to Boone. The roadway has been marked as 'Alternate I-40' to aide traffic detouring around I-40 construction projects between Winston-Salem and Statesville.