Illinois County General Highway Map for Year 2013. Map shows all roads by type and other physical and cultural features. The County General Highway Maps emphasize the display of the road network outside the cities and villages.
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.