Based off: Functional Classification Maps from IDOT Maps Page
Freeways
These are interstates, highways, freeways, toll roads, and expressways that are multi-lane, divided roads with no stops (no traffic lights, exit and entrance from/to the road is through ramps).
| Road | Dir | Northern/ Western End |
Southern/ Eastern End |
Toll Road? | Notes |
|---|---|---|---|---|---|
| I-88 | W/E | IA Border | I-290/I-294 | Y | |
| I-55 | N/S | US 41 (Lake Shore Dr / Chicago) | MO Border (East St. Louis) |
N | known as Stevenson Expressway within Cook County |
Major Highway
A big highway, usually 3+ lanes, with minimal stops – mostly exits and interchanges, but possibly with some intersections and junctions. In Illinois these are designated as US Rte # or State Rte #.
| Road | Dir | Northern/ Western End |
Southern/ Eastern End |
Notes |
|---|---|---|---|---|
| IL 83 | N/S | north of 31st St. (Oak Brook) |
Archer Ave (Lemont) |
Continues as Minor Hwy north to xxx |
Minor Highways
Usually a narrower highway, 2 lanes or less, that has stops or traffic lights at almost every intersection, but is still a highway (minor US or state highway). These roads are generally important thoroughfare that goes through several cities or towns. In Illinois these are designated as US Rte # or State Rte #.
| Road | Dir | Northern/ Western End |
Southern/ Eastern End |
Notes |
|---|---|---|---|---|
| IL 83 | N/S | Devon Ave (Elk Grove Village) |
31st St (Oak Brook) |
Primary Street
These are major roads or boulevards in urban and suburban areas and have large amounts of use (such as xx). In less urban environments they are main thoroughfares in towns that are not US or state highways.
| Road | Dir | Northern/ Western End |
Southern/ Eastern End |
Notes |
|---|---|---|---|---|
| Boughton Rd | W/E | Naperville-Plainfield Rd (Bolingbrook) |
Woodward Ave (Woodridge) |
Continues east as 87th St |
To Be Categorized
These roads still have to be put in their proper places above.
| Road | Dir | Northern/ Western End |
Southern/ Eastern End |
Notes |
|---|---|---|---|---|
| US 6 | W/E | IA-IN borders (Moline - Lansing) | Grand Army of the Republic Highway | |