DuPage County Division of Transportation


DuPage County Division of Transportation

Project Cost


Market Sector

Local Government, Transportation


Environmental, Highways & Traffic, Surveying, Water Resources

75th Street Reconstruction from Adams Street to Plainfield Road

Darien, Illinois

  • Phase II design engineering services were performed for the reconstruction of one mile of 75th Street from west of Adams Street to east of Plainfield Road, upgrading it from a four-lane rural roadway section to a six-lane urban facility. The project also included the resurfacing of approximately one-half mile of existing pavement on Plainfield Road, the realignment of over 1/2 mile of the Southern Regional Trail along 75th Street, new sidewalk and ADA ramps.

  • The scope also included adding auxiliary lanes at the Cass Avenue and Plainfield Road intersections with 75th Street to further enhance traffic flow through the corridor. 75th Street within the project limits is designated as a strategic regional arterial.

  • Updated traffic projections were developed to evaluate proposed intersection geometrics approved several years earlier as part of the original Phase I Study. The new data, along with a detailed review of potential access, pedestrian and constructability issues, were used to modify the proposed geometrics accordingly.

  • The project also featured a complex maintenance of traffic scheme which involved three county routes with average daily traffic in excess of 20,000 vehicles per day and required extensive coordination with two adjacent schools and two large shopping centers.

  • A stormwater management permit for submittal to the DuPage County Department of Economic Planning and Development was completed.

  • Temporary traffic signals were designed for construction staging and all traffic signals within the project were modernized and replaced. A new interconnected traffic signal system was also designed as part of the project.

  • The project also included the removal of the City of Darien’s existing lighting system and replacement with new decorative light poles.

  • An addendum to the approved 75th Street Phase I Study was completed to document revisions to the roadway geometrics originally proposed within the project limits.

  • The project was federally funded (with CMAQ and STP funds) and processed through IDOT – Local Roads.