In 1926, a new alignment for Route 4 was opened on the northwest side of the Des Plaines River from Joliet to Lyons, and its previous alignment on Archer Avenue was renumbered as Route 4A.
A new alignment for Route 4 was opened on the northwest side of the Des Plaines River from Joliet to Lyons. This was in 1926. Its previous alignment on Archer Avenue was renumbered as Route 4A. This was in 1926.