Interstate 140

Interstate 140
State	NC/TN
Route	I-140
Type	Interstate
Length mi	(varies by designation)
Established	(varies by segment)
Direction a	West
Direction b	East
Spur of	I-40
Counties	(varies)

Interstate 140 is a pair of auxiliary Interstate Highways designated as spur routes of Interstate 40 serving urban and port corridors in the southeastern United States. One segment provides a bypass and connector in the Wilmington, North Carolina region adjacent to the Port of Wilmington and Cape Fear River, while another designation has been applied in the Knoxville, Tennessee area to relieve congestion near McGhee Tyson Airport and connect to Interstate 40 and Interstate 75. The corridors intersect multiple transportation, shipping, and regional planning jurisdictions such as the North Carolina Department of Transportation, the Tennessee Department of Transportation, the Metropolitan Planning Organization (MPO)s in their respective urban areas, and federal programs administered by the Federal Highway Administration.

Route description

The North Carolina segment functions as a partial beltway and connector that loops around the western periphery of Wilmington, providing access to US Route 17, US Route 76, and state routes that serve New Hanover County and Brunswick County. It facilitates movements between Interstate 40 traffic heading to the Port of Wilmington, the Cape Fear Community College area, and the Greater Wilmington Regional Airport corridor. Along its alignment the route crosses riverine features including the Cape Fear River floodplain and passes near conservation and recreation areas such as Carolina Beach State Park and Federal Point coastal zones. Interchanges along the route tie into arterial highways that serve industrial parks, logistics centers, and residential neighborhoods anchored by Wilmington International Airport influences and regional freight flows.

The Tennessee portion provides a spur around the southern and western approaches to Knoxville, connecting Interstate 40 near the Farragut and West Knoxville corridors with arterial routes toward McGhee Tyson Airport in Alcoa and Blount County. The roadway intersects major corridors such as US Route 129 (the Alcoa Highway), US Route 441, and links with commuter patterns feeding into downtown Knoxville, University of Tennessee, and suburban employment centers in Loudon County and Sevier County commuter sheds. The alignment traverses topography characteristic of the Appalachian Ridge-and-Valley physiographic province, with design considerations for grade, drainage, and right-of-way that involved coordination with Tennessee Valley Authority project areas and local utilities.

History

Planning for auxiliary connections to Interstate 40 emerged from mid-20th century highway expansion initiatives tied to the Federal-Aid Highway Act of 1956 and subsequent urban area transportation studies led by regional MPOs. In North Carolina, proposals evolved from state and port development goals aiming to improve access to the Port of Wilmington and to provide a hurricane evacuation and freight-relief route for US 421 and US 74 corridors. Environmental review processes included assessments under laws administered by the Environmental Protection Agency and stakeholder consultation with New Hanover County and Brunswick County elected officials.

In Tennessee, the designation followed traffic studies addressing congestion on US 129 and the need to connect I-40 to growing suburban and airport areas during the late 20th and early 21st centuries. Funding packages blended state transportation appropriations with federal highway funds and, in some phases, bond measures and local contributions from municipal governments like Knoxville and Alcoa. Construction milestones were coordinated with utilities, the Tennessee Department of Environment and Conservation, and historic preservation offices due to proximity to cultural resources and battlefield-era landscapes documented by the National Register of Historic Places.

Exit list

Exit numbering and interchange patterns vary between the North Carolina and Tennessee segments. Key exits on the North Carolina alignment include connections to US Route 17 toward Wilmington, ramps serving US Route 76 and NC Highway 132 that distribute traffic to retail and institutional nodes, and terminals tying into collector–distributor systems near industrial access roads serving the Port of Wilmington logistics complex. In Tennessee, principal interchanges provide links to US Route 129 (Alcoa Highway), US Route 441 toward Maryville, and connector ramps feeding State Route 168 (the Governor John Sevier Highway) that support airport access. Each interchange reflects design standards promulgated by the American Association of State Highway and Transportation Officials and incorporates auxiliary lanes where warranted for weaving movements and freight operations.

Future plans and improvements

Ongoing planning efforts contemplate widening, interchange reconfiguration, and multimodal integration to accommodate projected freight growth tied to port expansion in Wilmington and increased passenger demand near McGhee Tyson Airport. Proposed projects include ramp modifications to improve access to logistics terminals, bridge replacements to meet updated seismic and scour standards overseen by state departments of transportation, and corridor studies that coordinate with Amtrak service planning and regional transit authorities such as Cape Fear Public Transportation Authority and Knoxville Area Transit. Funding scenarios consider federal discretionary grants, surface transportation reauthorization programs, and public–private partnership proposals involving regional economic development agencies.

Auxiliary and related routes

Both regions feature related numbered and named connectors that distribute traffic from the spur corridors. In North Carolina, related routes include segments of US Route 74 and NC Highway 211 that form part of the coastal corridor network, while Tennessee’s network interfaces with Interstate 275 spur concepts and state routes that manage airport and industrial access in the Knox County area. Coordination between auxiliary route planning and statewide corridor designations is administered by the North Carolina Department of Transportation and the Tennessee Department of Transportation in conjunction with MPOs and county planning commissions to align improvements with freight, commuter, and emergency management objectives.

Category:Interstate Highways in North Carolina Category:Interstate Highways in Tennessee