Illinois Department of Transportation, Gary Hannig, Secretary

Interstate 55

Located in Will County, Illinois

City of Joliet & Village of Shorewood



I-55 from I-80 to US 52

The interchange project includes the conversion of the existing partial interchange at IL 59 and I-55 to a full access diverging diamond interchange also known as a DDI. A DDI is a double cross over diamond. The diamond shaped configuration allows for two directions of traffic on a bridge to cross to the opposite side of the bridge. The benefits of this type of interchange include improved safety and operations. This project provides connections for pedestrians and bicyclists over I-55 to IL 59 and new auxiliary lanes between IL 59 and US 52 to improve congestion and safety for vehicles entering and exiting the roadway.

Funding & Schedule

Preliminary engineering and environmental studies (Phase I) for the interchange project were completed in May 2019. The project has moved on to the next implementation phase, contract plan preparation and land acquisition (Phase II). This improvement is included in the Department’s Fiscal Year (FY) 2021-2026 Proposed Highway Improvement Program. Current engineering efforts are targeted to enable a contract letting in the early years of the multiyear program contingent upon plan readiness, land acquisition, and funding availability through future legislative appropriations.


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Noise Study

The I-55 from I-80 to US 52 study evaluated traffic noise impacts and recommended that potential noise walls be implemented along I-55 within the project study limits. Property owners and tenants that would achieve a benefit from these walls will have an opportunity to vote on whether or not the noise walls should be installed. The voting form was recently mailed to those benefitted by the proposed walls. Voting responses are due by April 3, 2020.

The I-55 from I-80 to US 52 Traffic Noise Analysis Report is available here.

The following exhibits may be downloaded as a PDF file: