Interstate 540 (I-540) and North Carolina Highway 540 (NC 540), also known as the Raleigh Outer Loop, form a partially completed beltway around the city of Raleigh, North Carolina, United States. When complete, it will fully encircle the city and nearby suburbs, meeting its parent route of I-40 in two locations. The first section from Durham to Knightdale is an Interstate Highway, and the remaining section from Garner to Durham is a North Carolina state highway.
The first section of I-540 runs from I-40 near the Raleigh–Durham International Airport to I-87/U.S. Highway 64 (US 64)/US 264 south of Knightdale. The route opened in January 2007, and was intended to be renumbered to I-640 and an Interstate highway in full when completed. The NCDOT decided against both when it became financially unfeasible to construct the entire route with public funds within a reasonable timeframe.
The remaining portion of the route (approximately two-thirds of the total completed mileage) is a toll road (part of the Triangle Expressway) that has been constructed as a North Carolina state highway. The first section of NC 540 was opened in July 2007, extending westward from the western terminus of I-540. Further extensions have carried NC 540 around the western side of Wake County to its current southwestern terminus south of Apex; an extension to Garner was scheduled to open in late-August 2024, but was delayed to late-September 2024. The final project planned to complete the eastern leg from Garner to Knightdale under the same toll system also began construction in 2024 with a completion date of 2028.
Route description When completed, the beltway will total in length, surrounding the city of Raleigh and the towns of Apex, Cary, Garner, and Morrisville. The designation from I-540 and NC 540 happens at I-40, in Durham County, where I-540 goes east and NC 540 goes west.
The beltway is further broken down into four segments: Segment nameDesignationLocationLengthNorthern Wake ExpresswayI-540, NC 540NC 54 to I-87/US 64/US 264Western Wake ExpresswayNC 540NC 54 in Cary to NC 55 south of ApexSouthern Wake ExpresswayNC 540NC 55 to I-40 near GarnerEastern Wake Expressway (construction started in May 2024; estimated completion 2028)NC 540I-40 to I-87/US 64/US 264Total
Interstate 540 The I-540 portion begins at an interchange designated as exit 1 near I-40 (I-40 exit 283B) near the Raleigh–Durham International Airport, located right at the Durham–Wake county line. It travels northeast to Aviation Parkway (exit 2), then turns east along the southside of the Brier Creek neighborhood, with interchanges at Lumley Road (exit 3) and US 70 (exit 4). After crossing US 70, I-540 travels eastward across the mostly residential areas of North Raleigh, with several exits with major arterial roads, including Leesville Road (exit 7), NC 50/Creedmoor Road (exit 9), Six Forks Road (exit 11), and Falls of Neuse Road (exit 14). Turning southeast, there is a complex interchange with US 1/Capital Boulevard (exit 16) and Triangle Town Boulevard (exit 17), which provide access to the Triangle Town Center shopping mall and commercial district along Capital Boulevard. Shortly after the interchange with US 401/Louisburg Road (exit 18), I-540 crosses the Neuse River and then turns south towards Knightdale. I-540 immediately has an interchange with Buffaloe Road (exit 20). I-540 continues south paralleling both the Neuse River and Forestville Road. As I-540 enters Knightdale, it has an interchange with U.S. Highway 64 Business (US 64 Bus.)/Knightdale Boulevard (exit 24). About after the US 64 Bus. interchange, I-540 has its western terminus at I-87/US 64/US 264 (exit 26), though the roadway continues on for a short distance, and several ghost ramps indicate the planned connection to the rest of the loop.
North Carolina Highway 540
NC 540 is the designation given to the Western Wake Expressway, Southern Wake Expressway and the future Eastern Wake Expressway. The Western Wake Expressway and the Southern Wake Expressway also forms a portion of the Triangle Expressway toll road complex. The Southern Wake Expressway begins at a turbine interchange with I-40 and I-42 southeast of Garner. The road heads due west around suburban developments, having interchanges at NC 50 (exit 39), Old Stage Road (exit 43), US 401 (exit 45), Bells Lake Road (exit 47), and Holly Springs Road (exit 50). The road eventually reaches NC 55 (exit 54) just south of Apex, where it becomes the Western Wake Expressway. At this point, the road is heading due west and has two quick interchanges with Veridea Road (exit 55) and US 1 (exit 56) after turning to the northwest. Exit 56 connects to Salem Street, connecting to downtown Apex, while exit 59 connects to US 64 near the Beaver Creek Shopping Center. Now heading due north and between Green Level Church Road (to the west) and NC 55 (to the east), the road skirts the western edge of Cary, with interchanges at Green Level Road (exit 62) and Morrisville Parkway (exit 64). Just north of the former community of Carpenter (since annexed by Cary) is a second interchange with NC 55 (exit 66). The Triangle Expressway toll road splits at NC 540 at exit 67 to follow NC 885, along where the Triangle Expressway ends at NC 54 (exit 69) before meeting I-40 at exit 1 and continuing on as I-540.
Tolls
Toll NC 540, a segment of the Triangle Expressway, uses open road tolling and is operated by the North Carolina Turnpike Authority; tolling is between I-40/I-42 (exit 36) and NC 54 (exit 69). Electronic toll gantries are located on the expressway mainline between each interchange so that all motorists will pass through at least one. Tolls payable with a valid transponder (NC Quick Pass, E-ZPass, Peach Pass, or SunPass) or bill by mail, which uses automatic license plate recognition and charge double the posted rate with additional fees.
, the total toll rate for two-axle vehicles on the length of Toll NC 540 is $8.04 with valid transponder and $16.08 for bill-by-mail. Three-axle rates are twice the two-axle rates; four-or-more-axle rates are three times the two-axle rates.
History
Planning for the highway originally started in the early 1970s; by 1976, the "Northern Wake Expressway" was added to the planning map. In the mid-1980s, realizing that the growth in western Wake County may require more roads than planned, highway planners decided to expand the project as a new beltway around Raleigh. In 1992, construction began on the first section of the Northern Wake Expressway, connecting I-40 with US 70. On January 21, 1997, the freeway opened as I-540.
In the following 10 years, the now known Northern Wake Freeway (so not to be confused with the Triangle Expressway) made several extensions: December 11, 1999: From US 70/Glenwood Avenue (exit 4) to Leesville Road (exit 7). December 21, 2000: From Leesville Road (exit 7) to NC 50/Creedmoor Road (exit 9). June 29, 2001: From NC 50/Creedmoor Road (exit 9) to Falls of Neuse Road (exit 14). August 12, 2002: From Falls of Neuse Road (exit 14) to US 1/Capital Boulevard/Triangle Town Boulevard (exit 16). January 16, 2007: From Triangle Town Boulevard (exit 17) to US 64/US 264/Knightdale Bypass (exit 26).
From 1999 to 2002, each additional section of the freeway was designated as Future 540, until it connected with US 1.
On July 14, 2007, a section of the loop from I-40 west to NC 54 and NC 55 was opened. However, the route is signed not as I-540 but as NC 540. Officials decided to change the designation in early July at the urging of the North Carolina Turnpike Authority (NCTA). Work on the western and southern portions of the beltway, if paid for by state funds, would possibly not open until 2030. At the request of several Wake County mayors, the NCTA in 2006 began studying the use of tolls to complete these portions of the Outer Loop.
The Authority concluded in early 2007 that it would be financially feasible to build the western section (along with an extended Durham Freeway, which combined would be called the "Triangle Expressway") using toll funds. The NCTA apparently never wanted an Interstate designation for the Western Wake Parkway. To lessen motorist confusion about where I-540 ended, the route was truncated to the I-40 interchange. All I-540 signs that were put up along the unopened stretch between I-40 and NC 55 were taken down in early July 2007; the new section is now signed as NC 540. (In addition, I-540 as a completed loop would violate the Interstate numbering convention regarding three-digit routes, as spurs begin with an odd number and loops with an even number, and, at one point, I-640—the last remaining available number within the state, as I-240, I-440, and I-840 are already taken—was proposed for the loop.)
Work to build the Western Wake Freeway, which would be renamed the "Western Wake Parkway" under the toll proposal, began August 12, 2009, with the Triangle Parkway portion opening in December 2011, and Western Wake portion scheduled to open in two phases in 2012.
In October 2008, the authority was unable to issue bonds to fund the Western Wake Turnpike project as planned due to market conditions affecting municipal bonds such as those. On July 29, 2009, the Authority closed on a revised $1.01-billion (equivalent to $ in ) bond plan, consisting of $270 million (equivalent to $ in ) in toll revenue bonds, $353 million (equivalent to $ in ) in Build America Bonds, and a $387-million (equivalent to $ in ) loan from the US Department of Transportation under the Transportation Infrastructure Finance and Innovation Act.
Groundbreaking was held on August 12, 2009, at the west end of I-540. "A dozen dignitaries" used shovels painted gold as 150 watched.
After work began on Western Wake Parkway in 2009, engineering and environmental studies began a year later for the Southern and Eastern Wake Freeways, also known as the Triangle Expressway Southeast Extension. Construction would begin in 2014 and be completed by 2019; however, it was delayed in March 2011 by the enactment of North Carolina Session Law 2011-7 (N.C. S.L. 2011–7), which forbade the North Carolina Department of Transportation (NCDOT) to consider a few alternative routes.
In 2010, NCDOT made an interchange improvement at I-540/I-40, adding another auxiliary lane from I-540 south to I-40 west at a cost of $4.8 million (equivalent to $ in ).
The completed Triangle Parkway, the first section of the Triangle Expressway, with its connection to NC 540, opened on December 8, 2011, reestablishing exit 67. Collection of tolls began on January 3, 2012. On August 1, 2012, the first phase of the Western Wake Freeway opened, connecting NC 55 in Morrisville (exit 66) to US 64 in Apex. The next day tolling began on the previously open section from NC 54 to NC 55. The final phase of the tolled section of NC 540, from US 64 to NC 55 north of Holly Springs, opened on December 20, 2012. Tolling for this section began January 2, 2013. On April 3, 2017, the Veridea Parkway interchange (exit 55; formally known as Old Holly Springs Apex Road) was opened to traffic. At a cost of $20 million (equivalent to $ in ), it was constructed by Blythe Construction and Kimley-Horn. An interchange with the newly extended Morrisville Parkway (exit 64) opened to traffic on February 3, 2020.
Southern Wake Expressway