I-55 Managed Lane Project

The Illinois Department of Transportation completed preliminary engineering and environmental studies (Phase I) for the improvement of Interstate 55 from Interstate 355 to Interstate 90/94 to add at least one lane in each direction within the existing median. The existing travel lanes along I-55 will remain free, but the new lanes are proposed to be managed as Express Toll Lanes (ETL) with dynamic pricing to provide travel choices within the corridor. Read more>>

The Illinois Department of Transportation (Department) completed preliminary engineering and environmental studies (Phase I) for the improvement of I-55 from Interstate 355 (I-355) to Interstate 90/94 (I-90/94). The improvement consists of the addition of one lane along I-55 in each direction between I-355 and east of Interstate 294 (I-294) and two lanes in each direction from east of I-294 to I-90/94, the most congested portion of the I-55 corridor. These improvements will address the projected congestion through 2050. Environmental approval was received by the Federal Highway Administration in December 2018. A previous Phase I study was completed in November 2016 for one managed lane in each direction.

The study evaluated multiple alternatives for this corridor and Express Toll Lanes (ETL) showed the best improvement for traffic flow and congestion relief. The existing travel lanes along I-55 will remain free, but the new lanes are proposed to be managed as express toll lanes (ETL) with dynamic pricing to provide travel choices within the corridor. The addition of the ETL within the existing median will provide options to adapt to frequently changing traffic conditions across all lanes and provide a sustainable transportation solution. The addition of the ETL would also increase the capacity of the overall roadway. As a result, the existing travel (free) lanes would also experience reduced congestion.

Who's Conducting the Study?

Illinois Department of Transportation (IDOT) has managed the consulting contracts and overall study. IDOT was a joint lead agency with Federal Highway Administration (FHWA) for the preliminary engineering and environmental study. A consultant team lead by Stantec conducted the environmental study for the I-55 Managed Lane Project for IDOT.

How Can I Get Involved?

CONTEXT SENSITIVE SOLUTIONS

IDOT's Context Sensitive Solutions (CSS) policy was used on this project. Public involvement is a key component of CSS.

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