Illinois Route 18 runs east-west where central Illinois meets north-central Illinois. It connects Henry, Streator, and really no other towns. It appears as a northern alternate to Illinois 17; I'm not sure if that has anything to do with its numbering as 17 plus 1. I drove this road from east to west in its entirety, so I am listing the junctions here starting in the east and going west.
Illinois 18's eastern end is a split with Illinois 17 west of Dwight:
Illinois 18's eastern end is a split with Illinois 17 west of Dwight:
Illinois 18 and Illinois 23 cross paths in Streator, with each route taking the form of a pair of one-way streets:
Near Lostant, Illinois 18 crosses Illinois 251:
Illinois 18 crosses Illinois 89 near the town of Magnolia:
Just after that junction, Illinois 18 meets a classic diamond interchange with Interstate 39:
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About a mile before crossing the Illinois River, Illinois 18 is joined by Illinois 26 from the north:
After a short concurrency, Illinois 26 splits from Illinois 18 to continue south along the east bank of the Illinois River:
After crossing an Illinois River bridge into Henry, Illinois 18 ends in that town, at Illinois 29.
