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HNTB Corporation

Northwest Corridor Express Lanes

Award Category: 
Private Sector Innovation
Award Year: 
2020

HNTB Corporation

Award Category: 
Private Sector Innovation
Award Year: 
2020

Recognized as the No. 1 project on the 2018 Roads & Bridges Top 10 Roads list, the Northwest Corridor (NWC) Express Lanes represents the largest single investment in Georgia’s transportation infrastructure and one of the most transformative projects in state history. Acknowledged as the most innovative and complex express lanes project in the country due to being a fully reversible system spanning across two counties and two interstates, as well as a dual-agency endeavor. These Express Lanes not only improve traffic flow, they have provided enhanced transit opportunities, boosted mobility, and driven economic development.

The project extends along I-75 and I-575 in Cobb and Cherokee Counties, northwest of the city of Atlanta. This 29.7-mile reversible tolled system (traveling southbound toward Atlanta in the morning commute and northbound in the evening) included the design of four new Express Lane access interchanges on I-75, 14 slip ramp access points along I-75 and I-575, and 39 bridges with lengths totaling approximately 27,500 LF and deck area totaling 1.02 million SF.

The project was delivered through a P3 and DBF model that ensured an on-time and on-budget delivery. The DBF model was streamlined to include less private financing and greater control for the state.

HNTB Corporation served as the Program Management Consultant (PMC) for the project, which was led by the Georgia Department of Transportation’s (Georgia DOT) Office of Innovative Delivery (OID) and is operated by the State Road and Tollway Authority (SRTA).

Learn more about Georgia’s Northwest Corridor Express Lanes.