^Guide marker in Peoria, near Illinois 6, September 2023.
Illinois Route 40 is a north-south highway linking northwestern Illinois and the Peoria area. It runs north out of the heart of Peoria, though Sterling-Rock Falls to end at Mount Carroll.
The northern end of Illinois 40 is in Mount Carroll at Illinois 78, just south of that route's junction with US Route 52/Illinois 64:
The northern end of Illinois 40 is in Mount Carroll at Illinois 78, just south of that route's junction with US Route 52/Illinois 64:
Illinois 40 zigzags southeasterly through Chadwick and Milledgeville, then turns southerly into Sterling, meeting the southwestern end of Illinois 2:
After crossing the Rock River into Rock Falls, Illinois 40 crosses US Route 30:
Departing from Rock Falls, Illinois 40 meets an interchange with Interstate 88:
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About 5 miles south of Rock Falls, Illinois 40 reaches the northeastern end of Illinois 172:
South of the tiny town of Deer Grove, Illinois 40 crosses Illinois 92:
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Near Bradford, Illinois 40 meets the eastern end of Illinois 93:
Illinois 17 joins Illinois 40 east through Camp Grove:
At a family fun farm known as Tanner's Orchard (home of award-winning apple cider that's tasty yet absurdly overpriced), Illinois 17 splits from Illinois 40 to head eastward again:
West of Chillicothe, Illinois 40 connects to the eastern terminus of Illinois 90:
Entering Peoria, Illinois 40 meets a full interchange with the Illinois 6 freeway...
In Peoria, Illinois 40 crosses US Route 150 at a 4-way intersection that has a twist; northbound travelers turn left onto US Route 150 westbound using a peripheral diagonal:
Reaching the heart of Peoria, Illinois 40 flirts with Interstate 74, paralleling that freeway as a pair of one-way streets, before finally continuing southward:
Illinois 40 crosses the Illinois River into East Peoria as Washington Street, then splits from that alignment via trumpet interchange to a connector backtracking to Interstate 74, where Illinois 40 ends.
