^Northbound Illinois 83 just south of Interstate 80 and Interstate 94 near Lansing, July 2020.
Illinois Route 83 forms a sort of beltway around Chicago, running through the western suburbs as a north-south route, then running through the southern suburbs as an east-west route. Almost all of it is a surface road, except a short section in the western suburbs, where it forms somewhat of an expressway with interchanges.
The northern end of Illinois 83 is the Wisconsin border, where Wisconsin Highway 83 retains its number as it crosses over, north of Antioch:
On the south side of Mount Prospect, Illinois 83 crosses Illinois 58:
Entering Des Plaines, Illinois 83 meets the eastern end of Illinois 62:
Illinois 83 turns west off of Elmhurst Road to head under Interstate 90 with no interchange, but access to the Interstate is provided if you head south a quarter mile on Elmhurst Road to one of the first diverging diamond interchanges in Illinois!
Illinois 83, now heading west, encounters Illinois 72 which joins the route west for about a block:
Very shortly after, Illinois 83 turns southerly to leave Illinois 72 continuing west on its own:
Illinois 83 meets the current eastern extent of Illinois 390, which continues to be extended eastward:
Illinois 83, in Oak Brook, has a partial interchange with Interstate 88, where travelers can only access Interstate 88 eastbound; you may need to head east or west down 22nd Street to complete the transfer between the two routes: