Garden State Parkway / I-78 Interchange Improvement

The New Jersey Turnpike Authority  needed to improve the flow of traffic at a highly congested Garden State Parkway/I-78 interchange. To meet this challenge, their plan called for the addition of two major highway bridge ramps. One would carry the exiting northbound traffic over the Parkway itself. The other would bring it back over and onto eastbound I-78.

 

As a trusted subconsultant to Gannett Fleming, Modjeski and Masters provided services that included the design of the 1,350-ft. bridge over I-78. First, our strategy mandated the optimization of the span arrangement of the curved steel I-girder highway bridge. This required consideration of existing infrastructure, horizontal and vertical highway clearances, and a solution aimed at minimizing traffic disruptions. We then executed the bridge design using a number of innovative practices. Strategically placed drilled shaft foundations reduced the footprint of the new interchange. And integral pier cross-girders helped meet clearance requirements for the longest and deepest girder spans.