Interstate 355 (I-355), also known as the Veterans Memorial Tollway, is an interstate highway and tollway in the western and southwest suburbs of Chicago, Illinois, U.S. Like other tollways in the northeastern portion of the state, I-355 is maintained by the Illinois State Toll Highway Authority (abbreviated ISTHA, but commonly referred to as the "tollway authority"). I-355 runs from Interstate 80 in New Lenox north to Interstate 290 in Itasca, a distance of 32.5 miles (52.3 km). The highway is six lanes wide for its entire length. The tollway authority opened I-355 as the North–South Tollway in 1989 to ease congestion on Illinois Route 53 (IL 53), a parallel two-lane state highway in central DuPage County. Initially, I-355 ran from Interstate 55 north to I-290. On November 11, 2007, the tollway authority opened a southern extension of I-355 from I-55 to I-80, a distance of 12.5 miles (20.1 km); on its opening, the tollway authority changed the name of the tollway to "Veterans Memorial Tollway".