Did You Know?


This project evaluated implementing two Express Toll Lanes (ETLs) in each direction on the eastern section of the corridor, between I-294 and I-90/94. The section from I-355 to I-294 will remain as one ETL in each direction as previously approved. There are still no changes in right-of-way needs and the evaluation built upon the previous study.

IDOT has made it a priority to seek alternative project delivery opportunities, such as a public-private partnership, or P3, in an effort to involve industry and best leverage resources for this important, regional project. This method helps IDOT deliver an I-55 project that is safest, most operationally efficient and makes the most financial sense for the public.

Toll Lane Graphic

Study Area

The study area is generally located at I-355 to the west and ends on the east at I-90/94 located in DuPage, and Cook counties in Illinois.

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Problem Statement

Interstate 55 experiences severe congestion for extended periods of time on a daily basis and is unable to accommodate the existing traffic demands (regional, daily commuter and local) due to limited roadway capacity, roadway design constraints at some locations, high truck volumes and numerous interchanges. In addition, commuters have limited available public transit options. This has resulted in increasingly long and unreliable travel times, decreased safety and increased costs for delivery of goods and services. The existing communities and businesses along the Interstate 55 corridor depend on it for a diversity of transportation services. Improving mobility in support of these needed services, and avoiding or minimizing community impacts, will require sustainable solutions within a constrained physical corridor and a limited funding environment. These solutions must seek to maximize the use of the existing infrastructure, support increased transit options and incorporate new revenue opportunities to support the implementation and maintenance of proposed improvements.

Project Purpose and Need:

  • Mobility and operational efficiency to adapt to changing travel demands
  • Congestion Management Strategies to improve system performance and travel time reliability
  • New travel choice in support of transit opportunities
  • Sustainable transportation solution that meets future environmental and economic needs
  • Maximize use of existing facility to adapt to funding constraints