Did You Know?


The scope of work for this project is anticipated to include the addition of managed or tolled lanes in each direction within the existing median of I-55 needed to accommodate implementation of managed lanes, which could include Express Toll Lanes (ETL), High Occupancy Vehicles (HOV) lanes, High Occupancy Toll (HOT) lanes, Congestion Priced lanes, or other feasible managed lane configurations as determined to be appropriate for a projected 2040 travel demand.

Phase I study includes data collection, mainline I-55 traffic studies, traffic management analysis, preparation of base maps and mosaics, geometric studies, mapping, ground survey, select Bridge Condition Reports, cursory bridge inventory and technical memorandum, crash analysis, drainage studies, probable construction cost estimates and financial plans, and other work necessary to complete Phase I.

The study area of I-55 begins at I-355 to the west and ends on the east at I-90/94; it is located within DuPage, and Cook Counties in Illinois. The study of I-55 will analyze the ability to provide congestion relief to commuters on I-55.

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.

view larger map »

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