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Owner: North Carolina Department of Transportation
Location: Charlotte, NC
Construction Cost: $98.7 million
Project Type: Highways and Bridges | Procurement Type: Design-Build
State: North Carolina | Status: Completed
The project consists of the design and construction of the interchange of Interstate 85 and Interstate 485 (Charlotte Outer Eastern Loop). The widening of I-85 and I-485 was needed to accommodate the new interchange configuration and to match the improvements taking place in the adjacent projects. Improvements were also needed along existing I-485 and in secondary Y-lines.
The existing I-485/I-85 Interchange is being modified to a turbine interchange that uses smaller, single-span bridges, smaller columns and flatter roadway profiles. Lane proposed the 2-level “turbine” Interchange for this project as it allowed for a significant reduction of earthwork and eliminated the need to haul material from off-site, drastically reducing construction cost by more than $30 million. The reduction in hauling also reduces wear on existing infrastructure and the project’s impact on traffic congestion, improving safety for the traveling public.
The first of its kind in North Carolina, and extremely uncommon in the United States, the turbine interchange design circles all left-turning traffic around a central bridge in a counter clockwise direction, creating a seamless movement between the two highways. It also requires fewer levels and has smaller bridges with smaller columns.
- 2012 Roads and Bridges Magazine’s Best of 2012
- 2013 NCSITE Outstanding Project Award
- 2015 National Award of Excellence - Design-Build Institute of America
- 2015 Excellence in Design Engineering - Design-Build Institute of America
- 2015 Design Build National Award of Merit - Design-Build Institute of America
- 2015 ENR Southeast Best Project - Highways/Bridges
- 2015 American Council of Engineering Companies (NC Chapter) - Engineering Excellence Award