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I-Last: Illinois Livable and Sustainable Transportation Rating System

In the years since the National Environmental Policy Act was signed into law in 1970, the range of concerns about the relationship between the highway and its associated effects on the surrounding environment has expanded. The approach of sustainability and I-LAST is to incorporate a broader range of issues into the development and completion of state highway projects.

This document is titled Illinois Livable and Sustainable Transportation (I-LAST) Rating System and Guide and is a sustainability performance metric system developed by the Joint Sustainability Group of the Illinois Department of Transportation (IDOT), the American Council of Engineering Companies (ACEC) and the Illinois Road and Transportation Builders Association (IRTBA). The intent is that this rating system and guide will be revised as the state of the art evolves – utilizing the input of industry users.