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Highway System

Illinois is at the heart of the country’s interstate highway system. This vast system consists of coast-to-coast interstates I-80 and I-90, along with I-70 that extends from the east coast to Utah. These major corridors are joined by multiple north – south corridors including I-39, I-55, and I-57 and additional east – west corridors such as I-24, I-64, and I-74.

In all, there are 2,185 interstate miles that serve the state, making Illinois the third ranking state in the U.S. There are a total of 15,969 miles of state highways and 7,847 bridges making the interstate route accessible across the entire state. More than 7,200 trucking establishments within Illinois take advantage of this extensive network of highways. 

Illinois is also home to seven of the 150 nationally designated scenic byways.


Interactive Data Tools

  • IROADS: Illinois Roadway Analysis Database System is a graphical application providing access to current and planned projects, roadway attributes, bridge inventory information, and pavement condition images.
  • Bridge Information: The Bridge Information tool offers bridge inspection and inventory information to the public.
  • Getting Around Illinois: Getting Around Illinois offers a variety of information for the traveling public. This link will route you to the Annual Average Daily Traffic counts for Illinois highway system.
  • GIS: The GIS tool offers downloadable roadway, railroad, and structure data by county or statewide.
  • SIMS: To fulfill the National Bridge Inspection Standards requirements, IDOT relies on local roads and streets agencies to collect and report inventory and inspection data for their structures. This link will allow you to access this information.
  • Hourly Traffic Data: The Hourly Traffic Data site provides hourly traffic information that displays both short-term traffic counts and continuous count station data collected throughout the state. Volume data is collected at all sites. Some sites will include volume, class, and speed data.


  • The Illinois Highway and Street Mileage Statistics publication contains information on the centerline miles totaled by IDOT District, county, pavement type, functional class, and urban areas.

  • The National Highway System (NHS) Illinois Statistics Sheet contains mileage, Vehicle Miles of Travel (VMT), and structure statistics for roads and bridges on the National Highway System. Mileage and VMT is summarized by functional class and road system. Structure data is summarized by road system and square footage, along with totals for structurally deficient and functionally obsolete NHS structures.

  • The Illinois Highway Statistics Sheet contains statewide mileage and VMT summary information by functional class and road system. Statewide totals as well as subtotals for the nine individual IDOT Highway Districts are displayed. Summary information about structures is also included.

  • The Illinois Travel Statistics booklet contains a variety of current and historical traffic information. VMT data is summarized by IDOT highway district, county, functional class, road system, and urbanized area. While statewide travel history dates back to 1950, individual county VMT subtotals have been tabulated for the last five years. Charts displaying monthly, daily, and hourly traffic patterns are also included.

  • The FY 2021 Condition Rating Survey Summary Report provides information on the condition of the highway system in categories (Excellent, Good, Fair, Poor), current and historical statistics about the amount of pavement grouped by the State of Acceptable Condition (SOAC) criteria, and the roughness (IRI International Roughness Index) by highway type and district.

  • The FHWA Highway Statistics publication consists of annual reports containing analyzed statistical information on motor fuel, motor vehicle registrations, driver licenses, highway user taxation, highway mileage, travel, and highway finance.

  • Crash data is analyzed by IDOT continually. Summary Crash Data reports are available for public viewing. IDOT is not authorized to release individual crash reports.

  • During the decade of the 90's, the Illinois Department of Transportation studied and produced reports on most of the Strategic Regional Arterial system. SRA reports and resources are available for public viewing.



Maps: The Maps section includes General Highway Maps depicting county, city, and township maps which emphasize the road network inside the specific geographic area, 5-Year Functional Classification (Rural & Urban) Maps allowing users to select a map that will provide graphical representation of the FHWA functional classifications of the roadways, and Annual Daily Traffic Maps. The maps are broken down IDOT districts. Maps are presented in PDF format.

Maps for other transportation modes can be found on the applicable Network Overview webpages.