Transportation, Department of
Our mission is to provide safe, cost-effective transportation for Illinois’ residents and visitors in ways that enhance quality of life, promote economic prosperity and demonstrate respect for the environment.

Designated Truck Route List, IDOT
A listing of all Class I and II Designated Truck Routes under the jurisdiction of the State of Illinois Department of Transportation and/or The Illinois Tollway or Chicago Skyway.
Disadvantaged Business Enterprise Certification
Pursuant to the requirements of federal regulations, all federal-aid recipients implement a “one-stop” certification process for Disadvantaged Business Enterprises (DBEs). Businesses involved in highway construction-related services (non-vertical), consultant, and supplier/equipment, rental/trucking services are considered for participation in IDOT’s DBE Program.
Find Current Winter Road Conditions
Weather, construction and road closure maps
Find State Road Project Information
This section of IDOT's website showcases projects that the department seeks to keep the public updated on. Utilizing the map and lists provided on this site, you will find significant information on featured projects such as overview, benefits, scope, public involvement and timely news, status and updates on current construction projects.
Illinois Bridge Information Search
Offers offer bridge inspection and inventory information to the public.
Illinois Roads Interactive Map
Web-based interactive mapping site that provides the ability to search and display several sources of transportation data. You can find information on winter road conditions, annual average daily traffic, road construction, trucking routes, and planned road projects.
Construction Procurements
In order to perform construction work for IDOT, contractors must first seek prequalification in specialized categories. Once prequalified, a firm is eligible to submit a bid on state and local advertised projects. If awarded the contract, the firm follows department rules and regulations until fulfillment of the contractual obligation.
Doing Business with Illinois Dept. Transportation
IDOT continually advertises its need for professional services, construction and specialized material needs through its "Doing Business with IDOT" site.
Find a Location in Illinois
This data contains rest-area related information to provide basic location and service information to the traveling public.
Gateway Traveler Information System Interactive Map
Weather, construction, road closure maps
Map of Illinois Weigh Stations
IDOT Map of Weigh Stations
Aircraft Registration
State law requires aircraft owners who reside in Illinois and fly their aircraft in the state to register their aircraft with IDOT.
Highway Permits
IDOT requires a permit when working within the right-of-way of an interstate, U.S. state route, Illinois state route or state-maintained roadway. A permit must be obtained prior to the start of any work and a copy of the approved permit must be at the worksite at all times.
Register for Traffic Alerts
A free service that provides email notifications of up to date traffic information on user-selected trips along the expressways in the Travel Midwest coverage area.
School Bus Inspections
Provides information on regulating and overseeing both scheduled and non-scheduled school bus inspections.
Oversize/Overweight Permits
IDOT may, at its discretion, upon application and good cause being shown therefore, issue special permits authorizing applicants to operate or move a vehicle or combination of vehicles of a size or weight of vehicle or load exceeding the maximum specified in this Act or otherwise not in conformity with this Act upon any highway under the jurisdiction of the state of Illinois.
Outdoor Advertising Permits
This section outlines the process by which to legally Advertise Adjacent to Primary and Interstate Highways.
Utility Permits
Provides the process and resources for applying for a permit for Utility Work in right-of-way (new installations, maintenance of existing utilities and utility relocations; mainly for municipalities and utility companies.)
Illinois Rest Areas
Rest area related information such as services available, location information, location and rest area name.
Producer/Supplier Approval
There are approximately 13,000 (active/inactive) producers and/or suppliers listed with IDOT. Producers and/or suppliers interested in providing materials to be used in construction projects must first obtain approval by the department.
Hot Mix Asphalt Material Approval
Develops and maintains statewide Hot Mix Asphalt (HMA) related policies, procedures and specifications for directing implementation of the statewide HMA mixtures program. Inspects and approves hot mix asphalt plants, maintains approved lists for truck bed release agents, warm mix technologies, and reclaimed asphalt shingle processing facilities.
Pilot Registration
Pilots who reside in Illinois are required to register their federal certificate with the state.
Find Road Conditions
The real-time maps on the Travel Midwest site are created from data provided by a variety of sources including the Illinois DOT, the Illinois Tollway, the Chicago Skyway, the Wisconsin DOT, the Indiana DOT, the Indiana Toll Road, the Michigan DOT and the Minnesota DOT.
Airport & Heliport Certification
IDOT is empowered and directed to encourage, foster and assist in the development of aeronautics in this state and to encourage the establishment of airports and other air navigation facilities. The Division of Aeronautics classifies and approves airports and restricted landing areas and any alterations or extensions thereof.
Bicycling in Illinois
Illinois seeks to develop bicycle policies that promote safe, sustainable and fiscally responsible bicycling in Illinois.
Find Public Transportation
IDOT provides technical assistance and financial resources to public transportation providers and rail operators in an effort to provide mobility options that support an interconnected transportation network allowing efficient movement of people and goods throughout the state.
Rest Area Agreements
Provides forms for vendors wishing to distribute newspapers or free travel publications to the traveling public at Illinois highway rest areas.
Soils Material Approval
Provides process and how to get soil materials approved.
Road Construction Contract Status System
Prequalification procedures for contractors helping firms become eligible to submit a bid on state and local advertised projects.
Special Sign Permits
Provides information on special sign programs that provide motorists with business identification and directional information for eligible motorist services, attractions, and tourist-oriented businesses.
Highway Authority Agreements
An agreement with a highway authority may be used where a property owner has contaminated public right-of-way or where the public right-of-way may become impacted in the future.
Agregate Material Approval
Various tests, including quality, freeze-thaw and alkali-silica reactivity (ASR) are performed on aggregates used for road and bridge construction in Illinois. These tests quantify the physical characteristics of each aggregate product from each source. Development and evaluation of all statewide aggregate related policies, procedures and specifications are continually modified to keep them current with new technologies and test procedures. Provides information regarding the process and how to get materials approved.
Analytical Chemistry Approval
Analytical chemistry provides the chemical testing for a wide variety of highway materials, ensures that quality materials are used in highway projects by maintaining a system of sampling, testing, documentation, and reporting of test results for focus areas including: pavement marking materials, reflective sheeting, bridge coatings, and miscellaneous items. Analytical chemistry also maintains cement and concrete reference laboratory (CCRL) accreditation for cementitious materials. Provides information regarding the process and how to get materials approved.
Bituminous Chemistry Material Approval
Bituminous Chemistry ensures that quality materials are used in highway projects by maintaining a system of sampling, testing, documentation, and reporting of test results for focus areas including: performance graded (PG) asphalt binders, asphalt emulsions, cutback asphalts, and various asphaltic products. Bituminous chemistry also maintains the American Association of State Highway and Transportation Officials (AASHTO) accreditation for PG asphalt binders and emulsified asphalts and manages certification policies and approved lists for PG asphalt binders, asphalt emulsions, and cutback asphalts.
Cement Material Approval
Focus areas include testing, acceptance and approval of portland and blended cement, other special cements, ground granulated blast furnace slag (GGBF), microsilica (silica fume), high reactivity metakaolin, fly ash, and other miscellaneous cement products. Other focus areas include research studies regarding cement and finely divided mineral applications, and methods for improving cement and finely divided mineral quality throughout the state.
Concrete Material Approval
Focus areas are testing, acceptance and approval of products such as admixtures, curing compounds, pre-packaged concrete products, freeze-thaw durable aggregates, and other miscellaneous products related to concrete. Provides information regarding the process and how to get materials approved.
Engineering/Architectural Procurements
Prior to any road or bridge being constructed, the department identifies the need for specialized work. In order to work for the department in this capacity, firms must first seek prequalification in specialized categories. Once prequalified a firm is eligible to submit a statement of interest on advertised projects. -acquisition-procurements
Land Acquisition Procurements
Extensive land acquisition activity is often required to complete IDOT's Multi-Year Multi-Modal Transportation Improvement Program. To accomplish the program without appreciably increasing the number of IDOT personnel or performing services for which the department does not have specialized expertise, the department utilizes outside vendors.
Metals Material Approval
Contractual metals and miscellaneous materials used in the State’s highway construction and maintenance programs are required by both the Federal Highway Administration and the State of Illinois Departmental Policy. In addition to materials testing the Department has several certification/qualification/approval programs requiring field inspection either at the manufacturing location or the job site.
Precast/Prestress Material Approval
Focus areas include quality control/quality assurance programs for Precast Concrete and Precast Prestressed Concrete products. Provides information regarding the process and how to get materials approved.