The widening of Ramp A at the I-75/SR 826 Interchange was the first widening of a precast segmental concrete bridge in the United States. The single-lane ramp, constructed in the early 1980s, was widened to accommodate two lanes of traffic. All construction activities associated with the widening took place without interrupting traffic. Ramp A is a 3,027-foot-long precast segmental concrete box girder bridge with span lengths up to 217 feet long. The ramp has 1,000-foot radii curves at each end. Segments were erected in balanced cantilever by ground-based cranes.

​Corven Engineering, an H&H company, served as the prime consultant and engineer of record. Services included developing three-dimensional construction analyses in determining the state of stress in the bridge, design of bridge strengthening using external longitudinal post-tensioning, the load rating of the widened bridge, shop drawing review, and engineering support during construction.