The Illinois State Toll Highway Authority (ISTHA) is a government agency responsible for the operation and maintenance of toll roads in the state of Illinois. Established in 1953, its primary goal is to provide safe and efficient transportation options for motorists while generating revenue through tolls to fund road improvements and expansions. ISTHA manages several major tollways, including the Tri-State Tollway and the Jane Addams Memorial Tollway. The agency also focuses on enhancing traffic flow and reducing congestion, ensuring that the toll roads meet the needs of the growing population and economy in Illinois.