^Westbound trailblazer welcoming Illinois 120 to its final stretch in Woodstock, May 2019.
Illinois Route 120 is an east-west route in the northern suburbs of Chicago, running through McHenry and Lake Counties. It starts in Woodstock and runs east to Waukegan.
The western end of Illinois 120 is on the northwest side of Woodstock at US Route 14:
After winding through downtown Woodstock, Illinois 120 crosses Illinois 47:
In McHenry, Illinois 31 comes from the south and joins Illinois 120 east for a bit:
Then, Illinois 31 splits off of Illinois 120 to continue north: