This was the second phase of the five-phase $1.7 billion Carolina Crossroads program, which consisted of the redesign and construction of the interchange at I-20 and Broad River Road. As the Lead Design Firm, ICE designed a highly innovative Offset Diverging Diamond Interchange (ODDI) and was responsible for the overall design management and coordination of the project. The ICE Team developed several unique approaches to address the project’s purpose and goals and determined that a semi-directional interchange concept was safer and operationally more efficient.
The final design was intended to reduce the number of accidents by enhancing safety operations at the interchange and to reduce long-term maintenance needs by decreasing the overall bridge area by 19,138 square feet. The Maintenance of Traffic (MOT) Plan was developed with the specific goal of minimizing traffic shifts and temporary lane closures and limiting construction phases for I-20, US 176, and the surrounding roadway network. ICE’s approach ensured that all lanes along I-20 and US 176 remained open while widening, median, and bridge work were underway. Throughout construction, ICE also provided quality control management through a dedicated team of certified QC inspectors and testing technicians, as well as geotechnical design for roadway, roadway structures, and bridge structures.
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