Related to the topic of Wisconsin border crossing signs, the sign on the border for I-41/94 has been missing for a few years now I think. I've wanted to reach out to WisDOT to have them replace it, but I haven't gotten around to it (much like they haven't gotten around to reinstalling one).
There haven't been DOT state line signs at that state line crossing in either direction for as long as I can remember. The best that I can remember, the line was just south of the lottery billboard on the southbound side and was right about at a speed limit sign on the northbound side. More recently, after the eight lane upgrades in Wisconsin, the 'Illinois' sign on the southbound side is very slightly (well less than a meter) inside of Wisconsin and the overhead weigh station sign on the northbound side is a couple of meters in Wisconsin, but there is no 'Wisconsin' sign at the state line.
Mike
The Welcome to Illinois sign is still there, and also has a plaque with "Lake County" on it. That one is IDOT-maintained, or at least it should be. I think you're right that it's slightly in Wisconsin though. Interesting.
Further north into the state? End I-41. So IDOT is not signing a single mile of I-41. (Except for an APL sign on 94, a "through traffic go here" sign on US-41 prior to the merge, and the NB ramp off Russell Road - all installed by ISTHA, but the road itself was built by WisDOT to Russell Road)
Take a clear look at the south face of the Hwy ML overpass, you will find your welcome "sign". Still a bit in for one
