In 1975, Illinois 5 was designated as the East-West Tollway and extended to Rock Island, replacing some of Illinois Route 2 in the process.
Illinois 5 was designated as the East-West Tollway 2 in the process. This was in 1975. Illinois 5 was extended to Rock Island. This was in 1975. Illinois 5 was replacing some of Illinois Route 2 in the process. This was in 1975.