Then IDOT should use Gary as a main control city at 55/80 because Gary is where you make your decision of Indy, Toledo, or Detroit. Hell, they should also use Quad Cities (or Moline-Rock Island) at 55/80 before using Des Moines. As far as the use of Indiana and Wisconsin on the Tri-State goes, I am ok with that because it (294) is a bypass of Chicago and not a lengthy interstate. That's my gripe.
But if a DOT should start using control cities where a driver has to start choosing between routes, it starts becoming annoying like I-80 through Pennsylvania where instead of a major city being used a bunch of smaller cities than an out of stater might never have heard of are used. Some possibilities if the control city where the route splits are used:
Illinois - May not be the best choice for an example since Illinois is good at providing secondary control cities
I-55* Troy - Split with I-70 to Indianapolis; some of the signs along the I-55/70 multiplex just use Chicago
* Springfield (used on some signs now; split with I-72 to Decatur
* Lincoln - Split with I-155 to Peoria
* Bloomington/Normal - Split with I-39
* Joliet -Access to I-80
I-64* Nashville (IL) - intersection with IL 127 (future expressway down to Murphysboro and Carbondale)
* Mount Vernon - Split with traffic heading south on I-57 to Marion and traffic heading to I-24
MissouriI-44* Gray Summit - Somewhat major split with westbound MO 100 (signalized expressway) taking traffic to Washington, eastbound MO 100 (was a future expressway) taking traffic to some of the western St. Louis suburbs.
* Union (westbound) - Split with US 50 (future expressway)
* St. Clair - Intersection with MO 47, MO 30. MO 30 is a decently used alternative to I-44
* Rolla - Intersection with US 63 (65 mph highway, future expressway)
* Lebanon (eastbound) - Intersection with MO 5, (future expressway), major route to Lake of the Ozarks
* Springfield - Intersections with US 65 and US 60 expressways
* Fidelity (eastbound) - Intersection with US 71/Future I-49 north to Kansas City
* Joplin - Intersection with US 71/Future I-49 south to Bentonville and Fort Smith
* Loma Linda (westbound) - Split with US 400, a somewhat expressway route into Kansas
I-55* Festus or Crystal City - Since the US 67 expressway takes a great amount of traffic, possible a major route in the future to Little Rock
When you enter Illinois from Kenosha on 94, I have no problem with Indiana being mentioned with Chicago like it currently is signed. But I would agree that O'Hare should used too on that sign.
But not all traffic may be destined for Indiana; there could be some heading for I-55 and/or I-57, so Indiana should not be listed. If Indiana is listed why not Missouri or even Kentucky (via I-24)?
As far as when you are in Downtown Chicago, the use of Wisconsin and Indiana is fine since 90/94 are cosigned together. However, at the respective splits, IDOT does use Milwaukee for 94 and O'Hare-Rockford for 90. There is even one sign just after the I-190 exit going west that mentions Madison but then the next mention of Madison on 90 is not until you reach I-39.
At the other end (Skyway Jct), the use of the generic Indiana for 94 East is ok but i would add South Suburbs or Kankakee or Memphis since 94 connects with I-57 6 miles later. They already mention on the 90 East Skyway sign "to Indiana Toll Road" which is also fine. It's just I-80 that annoys me.
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