ISTHA Open Road Tolling Plazas 51, 52, 54 and 55
Owner: Illinois State Toll Highway Authority
Location: DuPage County, Illinois
Infrastructure Engineering, Inc. worked on a team to prepare the preliminary and final designs and plans for the creation of the new toll collection system at Plaza 52, Plaza 54 and Plaza 55. The eastbound lanes' toll collection system at Plaza 51 was eliminated. IEI was responsible for the design of all 6 retaining walls.