Interstate 155 was built as a way to get to Peoria from points south along Interstate 55, like Springfield and St. Louis. It's also handy as a shortcut for getting to Galesburg and the Quad Cities from those southerly points, via Interstates 55, 155, and 74. The northern end is at Interstate 74 in Morton, just shy of Peoria, and from there Interstate 155 runs about 32 miles south to Interstate 55 at Lincoln, shy of Springfield. This 32-mile north-south section of freeway lies in a rural zone west of Bloomington-Normal in central Illinois, within Tazewell and Logan Counties.
Exits and miles are numbered in increasing order from south to north, in accordance with the national standard for mile numbering. Exits will be listed on this page according to that same sequence, from south to north.
Interstate 155's southern beginning is at Interstate 55 on the northwest side of Lincoln, about 25 miles north of Springfield. Exit 0A is the ramp to Interstate 55 south toward St. Louis, and Exit 0B is the ramp to Interstate 55 north toward Chicago...
Exit 6 is for a local road leading to the small town of Hartsburg...
Exit 10 is for US Route 136, which leads to Havana and McLean...
Exit 15 is for Illinois 122 west toward Delavan, at an interchange where Illinois 122 comes from the west to join Interstate 155 north:
Exit 19 is for Illinois 122 east toward Hopedale, at the point where Illinois 122 ends its concurrency to continue eastward past Interstate 155:
Exit 22 is for Townline Road, a county road in rural Tazewell County:
Exit 25 is for Illinois 9, signed as a route to Pekin and Bloomington, even though the town of Tremont is right next to the interchange:
Exit 28 is for Broadway Road, named after its eventual existence as Broadway Street in Pekin to the west:
Exit 29 is a partial-access interchange to the southern beginning of Morton's Main Street; this only allows access to/from the south:
Exit 30 for Queenwood Road in Morton only provides access to/from the north, completing the set of 4 ramps between Exits 29 and 30:
Exit 31 is for Birchwood Street and the eastern end of Illinois 98:
Around mile marker 32, Interstate 155 reaches its northern end, with the left ramp leading to Interstate 74 west toward Peoria, and the right-hand ramp leading to Interstate 74 east toward Bloomington...