You might think a state highway with a small number like 8 would be a highly important one, but Illinois Route 8 is neither heavily-trafficked nor long enough to span more than three counties. It isn't a minor route, either, though, serving the sizeable city of Peoria. Illinois 8 basically runs from a couple towns west of Peoria, to a couple towns east of Peoria. The west end is at Illinois 97 southeast of Galesburg in Knox County, and after passing through Peoria and Peoria County, Illinois 8 ends approaching Washington, Illinois, in Tazewell County.
Illinois 8 begins at Illinois 97 southeast of Galesburg, and it starts out going east: