Transportation
$3.2B Elevated Express Lanes Set Course for NCDOT’s I-77 South Project
Design choice moves the Charlotte corridor toward a bridge-heavy P3 as federal environmental review begins
An NCDOT rendering shows a conceptual elevated express-lane configuration at the I-77/I-277 interchange near uptown Charlotte, illustrating how managed lanes could pass over existing roadways in a constrained urban corridor.
The North Carolina Dept. of Transportation confirmed in early February that it will move forward with an elevated express-lane concept for the I-77 South corridor through Charlotte. The decision follows more than a year of sometimes contentious public engagement and advances the project toward environmental review.
In a Feb. 4 update, NCDOT said the elevated option emerged after evaluating multiple alternatives for the roughly 11-mile stretch of interstate between I-277 and the South Carolina line, where dense development and limited right-of-way constrain conventional widening.
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“NCDOT’s priority is to deliver transportation improvements in partnership with the region that respect the history of the [project] neighborhoods,” Felix Obregon, division engineer for NCDOT’s Division 10, said in a statement.
“Community feedback has been critical in shaping this project, and the elevated design option balances regional mobility needs with meaningful reductions in neighborhood and environmental impacts,” he added.
The decision represents a defining shift in the project’s engineering profile. By placing managed express lanes on structure through the most constrained segments, the plan transforms what might otherwise have been a roadway expansion into a bridge-intensive urban megaproject, with design effort expected to concentrate on foundations, columns, superstructure systems, drainage on structure and construction staging in live traffic.
According to an NCDOT project video, the southern portion of I-77 currently carries about 160,000 vehicles per day and includes 13 interchanges and multiple bridges, most of which are anticipated to be improved as part of the project, underscoring the corridor’s scale and structural complexity.
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While final geometry has not been released, the elevated approach implies a corridor dominated by long viaduct segments, frequent pier placement and interchange flyovers, rather than continuous at-grade widening. For contractors, that shifts risk toward subsurface conditions, utility conflicts, traffic maintenance and long-term inspection obligations, rather than earthwork quantities.
A Go-To Urban Construct
An NCDOT diagram illustrates two elevated express-lane concepts—side-mounted and stacked—showing how managed lanes could be built above or alongside existing general-purpose lanes, depending on corridor constraints.
Rendering courtesy of NCDOT.
The elevated approach aligns the project, at least in concept if not final scale, with other large managed-lane programs in densely populated urban corridors, such as Dallas’ LBJ TEXpress and the I-75 Northwest Corridor Express Lanes in Atlanta, where elevation reduced property takings and kept traffic flowing during construction.
Like those projects, I-77 South is positioned as a long-term investment in capacity and reliability rather than a short-term congestion fix.
The project originated from a locally led study by the Charlotte Regional Transportation Planning Organization, consistent with North Carolina’s policy that toll projects begin at the regional level.
NCDOT estimates the project’s cost at approximately $3.2 billion, a planning-level figure that reflects bridge structures, interchange reconstruction and long-term operations. The department has indicated it expects to pursue a public-private partnership delivery model, with procurement to follow completion of environmental approvals.
The elevated decision comes as the project transitions into the National Environmental Policy Act process, overseen by the Federal Highway Administration. Environmental documentation is still in development, and NCDOT has not yet released a draft document or issued a record of decision. Agency officials have said public hearings tied to the environmental review are expected later this year.
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Selling a Skeptical Public
Community response remains mixed. At meetings held in late January and early February, residents acknowledged that the elevated concept could reduce displacement compared with at-grade widening, but raised concerns about noise, air quality and visual impacts associated with large viaducts in close proximity to neighborhoods.
“If you think about just people in general and how people want to live, then nobody wants to look out their window and see a big concrete bridge,” said Shauna Bell, a homeowner in McCrorey Heights, who spoke at a public meeting, according to Spectrum News 1 Charlotte. “Nobody wants to be outside and have more air pollution or more noise pollution.”
Comments on NCDOT’s YouTube channel reflect the range of views. One commenter asked, “Why not create commuter rail on existing Norfolk Southern trackage? Save the $3.2 billion.” Another wrote, “This is probably the best solution … for a metro the size of Charlotte, the I-77/US 74/I-277 interchange is horrible.”
Transportation advocates have also questioned the project’s underlying assumptions. Shannon Binns, executive director of Sustain Charlotte, a local advocacy group, said the decision highlights broader debates about how urban mobility investments are prioritized.
“As of today, there is no publicly available record showing that NCDOT ever studied a transit-first alternative for I-77 South before recommending toll lanes,” Binns said in a statement.
NCDOT has said alternatives such as tunneling or fully depressed roadways were evaluated and dismissed as financially unworkable at this stage, citing the cost and long-term maintenance burdens associated with underground highway construction in other U.S. cities.
From a procurement standpoint, the elevated concept effectively defines the type of teams likely to compete. The project’s scale, structural intensity and long-term operating requirements are expected to favor concessionaires experienced in urban viaduct construction, managed-lane toll systems and lifecycle asset management, rather than conventional highway widening.
Construction is not expected to begin until later in the decade, pending federal approvals and procurement completion.
Bryan Gottlieb is the online editor at Engineering News-Record (ENR).
Gottlieb is a five-time Society of Professional Journalists Excellence in Journalism award winner with more than a decade of experience covering business, construction and community issues, including finance, law and real estate. He has reported for Adweek and the San Diego Daily Transcript and led a community newsroom in Santa Monica, Calif. He served as editor-in-chief of the Detroit Metro Times and as managing editor at Roofing Contractor, where he helped shape national industry coverage. At Engineering News-Record, Gottlieb covers breaking news, large-scale infrastructure and megaprojects, regulatory developments and business trends across the U.S. and global construction sectors.
email: gottliebb@enr.com | office: (248) 786-1591
.webp?height=200&t=1756376605&width=200 "Crews clear right-of-way along I-275 in Pinellas County as FDOT begins work on the $340-million express lane expansion, part of the Moving Florida Forward program.")
