June 11, 2011: The east end of IL 123 is just east of I-55, at the historic alignment of US 66. The last alignment of 66 runs left and right here, as a bypass around town; the ahead route is the original. Note the divided highway for old 66 running across the bottom. IL 123 also runs past Lincoln’s New Salem Historic Site.
This is also the mile number of I-80 at the west mixmaster.