US 66 in Illinois

Historic US 66 near Joliet, Ill.

Illinois is one of the states through which the former US 66 was routed. Almost all those states mark the former route of US 66 with Historic US 66 signs, and Illinois is no exception.

A short segment of Interstate 55 in the Chicago area runs along the old US 66 alignment. At the Joliet Road exit, the old US 66 route goes south into Joliet.

Also on the sign post is a typical mileage sticker used on Chicago-area expressways (but not on the separate, independent tollway system), showing mileage to hundredths of a mile.