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Converting the functionally obsolete cloverleaf interchange connecting I-70 and U.S. Route 19 into Pennsylvania’s first diverging diamond interchange required a traffic control plan to minimize disruptions to the tens of thousands of motorists who travel through the area daily.

The project called for a major traffic change, replacing a congested signal-controlled intersection in a primary commercial corridor with a three-lane roundabout.

Replacing the concrete open spandrel arch bridge that had served as Pittsburgh’s eastern gateway for nearly a century was more challenging than the original construction.

The two-story building targeting LEED Gold certification serves as a consolidated scientific research facility at one of the largest marine research centers in the country, according to the project team.

The unexpected discovery of a large underground rock formation could have easily derailed construction of this $21.8-million, 76,000-sq ft cancer treatment center.

The team behind this 170,000-sq ft, 70-bed hospital says the project delivered state-of-the-art health care services to a largely rural area in less than two years. 

The project team says that preserving the U.S. Capitol’s ornate facade involved “firsts” in the nation for the successful execution of large-scale laser ablation cleaning and stone consolidation to conserve a marble exterior.

The project team says planning and coordination were critical in constructing a new 340-megawatt energy facility at an existing Virginia power station using equipment repurposed from a plant in Florida.

The simultaneous restoration and modernization of four historic prototype libraries was designed to redefine the Philadelphia Public Library as a central neighborhood resource.