Elmhurst Road Reconstruction & Interchange Design

In 2011, the Illinois Tollway Board of Directors approved the 15-year, $12 billion capital program, Move Illinois: The Illinois Tollway Driving the Future. Move Illinois will deliver a dramatic facelift to I-90 by rebuilding and widening 62 miles between Rockford and O’Hare with 8 lanes from the Kennedy Expressway to Randall Road and 6 lanes from Randall Road to I-39. In addition, for the first time, the Tollway will accommodate transit options along the I-90 corridor.

The Elmhurst Road Interchange at the Jane Addams Memorial Tollway (I-90) is a crucial part of the reconstruction. The lack of a full-access interchange was identified by stakeholders during the planning process as a critical transportation issue within the project study area. The resulting project includes design for:

  • New full-access interchange featuring a double-crossover diamond (DCD) interchange with new dual structures carrying Elmhurst Road over I-90
  • Widening and reconstructing portions of Elmhurst Road north and south of the interchange
  • Improvements to two at-grade intersections

Lochmueller Group (Lochgroup), as the Lead Partner in a Joint Venture, is providing overall management, as well as roadway design and structural engineering.

The DCD configuration (formerly known as a diverging diamond) will allow for two-phase operation at all signalized intersections within the interchange. This will provide a significant improvement in safety, since no left-turns must clear opposing traffic and all movements are discrete, with most controlled by traffic signals.  Based on proposed traffic demand and turning lane configurations, single-lane toll collection facilities are required for the new eastbound exit ramp and westbound entrance ramp at the interchange.

The dual 2-span symmetrical structures carrying Elmhurst Road over I-90 are both 305 feet long with widths of 54 and 65 feet. In addition to three 14-foot-wide travel lanes, the bridges will also carry a 5-foot-wide sidewalk and a 10-foot-wide, multi-use path.


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