The Illinois State Toll Highway Authority (ISTHA) is an administrative agency of the U.S. state of Illinois charged with building, operating, and maintaining toll roads in the state. The roads, as well as the authority itself, are sometimes referred to as the Illinois Tollway. The system opened in 1958 in the Chicago area, and has subsequently expanded to include the eastern and central sections of Interstate 88 (I-88) extending into the northwestern part of the state. Beginning in 2005, the system was reconstructed to include more lanes and open road tolling, the latter of which uses I-Pass transponders to collect revenue as vehicles pass antennas at toll plazas or designated entrance or exit ramps. , ISTHA maintains and operates of tollways in 12 counties in Northern Illinois. History The original Toll Highway Authority was established in 1941. After construction of the first toll highways in Illinois was delayed by World War II, the Illinois State Toll Highway Commission was established in 1953. The first three toll highways in the Chicago area were all planned, constructed, and finally opened in 1958 under the authority of this Commission. These first three toll highways are the present day Jane Addams Memorial Tollway (I-90/I-39/US 51), the Tri-State Tollway (I-94/I-294) and the Ronald Reagan Memorial Tollway (I-88, between Hillside and Sugar Grove). The first segment to open was the Jane Addams Memorial Tollway between Devon Avenue and Elgin on August 20, 1958 at 3 p.m. The Toll Highway Act, in its present form, dates from 1967, but has been amended since. Under this Act, promulgated April 1, 1968, ISTHA assumed the assets and obligations of the Illinois State Toll Highway Commission. In the 1970s, the East–West Tollway was extended west from Sugar Grove to Dixon with a freeway continuing to the Quad Cities. The route was later given the I-88 designation in order to obtain a higher speed limit. In 2004, ISTHA voted to rename this route the Ronald Reagan Memorial Tollway. In June 1984, Republican minority leader of the Illinois House of Representatives, James "Pate" Philip, helped push through legislation authorizing the construction of the North–South Tollway, then referred to as simply the DuPage Tollway. Officials at the Morton Arboretum, one of the nation's premier woodland research centers, promptly filed a federal lawsuit to block construction of the tollway. They also promised to prevent the tollway authority from obtaining environmental approval from federal officials.