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Study Process

The I-55 Managed Lane Project followed the National Environmental Policy Act (NEPA). The Federal Highway Administration (FHWA) and Illinois Department of Transportation (IDOT) has completed an environmental study for the Managed Lane Project in order to satisfy NEPA requirements.

NEPA Process

The NEPA process requires federal agencies to integrate environmental values into their decision-making process by considering the environmental impacts of their proposed actions and reasonable alternatives to these actions. IDOT assessed the natural, built, and human environment to determine the extent of impacts that may arise from constructing and operating a project. Environmental factors such as air quality, wildlife, vegetation, water quality, wetlands, geology, neighborhoods, park/recreation areas, utilities, visual quality, and cultural resources were assessed. NEPA encourages early and frequent coordination with the public and resource agencies throughout the project development process. Public comments that were received during the alternative analysis phase were considered in the draft environmental document. Following NEPA guidelines, an environmental study document was approved in 2016 and a second study in 2018.

Study Process

Data Collection: Assess Existing/Future Conditions

  • Data Collection
  • Identify Deficiencies
  • Identify Goals and Objectives

Purpose and Need

  • Develop Purpose and Need

Alternatives and Evaluation

  • Identify Initial Alternatives
  • Develop Evaluation Criteria

Analysis of Alternatives

  • Evaluate Alternatives
  • Identification of alternatives to be carried forward

Preferred Alternative Refinement and Documentation

  • Refine Preferred Alternative
  • Select a Preferred Alternative
  • Preparation and issuance of the environmental documentation


The Phase I for the evaluation of Express Toll Lanes is complete.

Public involvement efforts for the most recent Phase I included one Corridor Planning Group meeting and one public meeting.

Schedule Graphic