I-275 Design / Build from SR 60 to Hillsborough River, $215-million Design-Build project includes reconstruction of all southbound lanes and bridges along the limited access corridor, as well as northbound lanes and bridges from SR 60 to Himes Avenue. The improvements to I-275 include the construction of 18 new bridges and the widening of three other bridges, as well as modifying ramps and interchanges to improve traffic flow. The construction consists of Florida Bulb-T girder bridges on pile and drilled shaft foundations, MSE walls, drainage installation, lighting, signalization and architectural features.