Illinois Route 122 is a fairly short east-west route in Tazewell County and western McLean County, connecting several small towns.  This is west of Bloomington and south of Peoria.

The western end of Illinois 122 is at Illinois 29 south of Green Valley:

After passing through Delavan, Illinois 122 joins Interstate 155 north for three miles:

Illinois 122 exits Interstate 155 and continues east:

West of Bloomington, Illinois 122 ends at Illinois 9, which comes from the north and continues east into that city.

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