^Southbound I-355 approaching the segment where the highway is side-by-side with Interstate 88 in Downers Grove, April 2025.
Interstate 355 is a north-south highway in Chicago's western and southwestern suburbs. Interstate 355 is almost completely tolled, save for the northern couple miles north of Army Trail Road. Interstate 290 provides the northern end of Interstate 290 near Addison and Itasca, and the southern end is at Interstate 80 near New Lenox, in Will County. The same corridor continues north as freeway along Interstate 290 and Illinois 53, up to the Lake/Cook County line.
Interstate 355's exits and mileage markers are listed in increasing order from south to north, as that type of numbering scheme is customary for north-south highways.
Interstate 355's southern beginning is at Interstate 80, just east of Joliet, near New Lenox. The southern end marker sits next to the split into ramps for Exit 0A to Interstate 80 west toward Indiana, and for Exit 0B to Interstate 80 east toward Iowa:
Interstate 355's exits and mileage markers are listed in increasing order from south to north, as that type of numbering scheme is customary for north-south highways.
Interstate 355's southern beginning is at Interstate 80, just east of Joliet, near New Lenox. The southern end marker sits next to the split into ramps for Exit 0A to Interstate 80 west toward Indiana, and for Exit 0B to Interstate 80 east toward Iowa:
Exit 1 is a fountain interchange for US Route 6, labeled "Southwest Highway":
Exit 4 is a diamond interchange to Illinois 7, also known as 159th Street:
Exit 7 leads to 143rd Street and Illinois 171, which follows Archer Avenue:
Exit 8 is for 127th Street:
Exit 12A leads to Interstate 55 north, toward Chicago:
Exit 12B leads to Interstate 55 south, toward St. Louis:
Exit 13 is for Boughton Road:
Exit 15 is for 75th Street:
Exit 17 provides access to 63rd Street and Hobson Road:
Exit 18 is for Maple Avenue:
Exit 19 is the southbound exit to US Route 34; this exit is labeled as "20B" coming from the northbound lanes:
Exit 20 leads to the ramps for Interstate 88 in both directions: east toward Chicago, or west toward Aurora (this ramp is shown as "20A" from the northbound lanes):
Exit 22 is for Illinois 56, known as Butterfield Road:
Exit 24 is for Illinois 38, which follows Roosevelt Road:
Exit 27 is for Illinois 64, which is routed along North Avenue:
Exit 29 leads to Army Trail Road at a partial-cloverleaf interchange; from here on northward, Interstate 355 is a freeway with no tolls:
Exit 31 is for US Route 20, also known as Lake Street, at a diamond interchange modified with directional northbound onramps:
After 32 miles, Interstate 355 ends at Interstate 290. A ramp splits off to the right toward Interstate 290 east, back toward Chicago, but most traffic that reaches this point gets on Interstate 290 west to continue north:
