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I went out on the National Road in Illinois yesterday for the first time since 2007. There were a couple things I wanted to see, including a rumored 9-foot-wide concrete road that is now on private property east of Martinsville. Sure enough, there it was. See the attached photo. If you look on Google Maps in Earth view, you can see it clearly. It's "Farm Ln" on the map. As you can see, the road was rerouted here to cross a railroad track at a safe angle (actually, a grade separation was created) -- and it left this old concrete behind.
Elsewhere on the IL NR, you can find segments of this 9-foot-wide road, but it has been augmented with additional concrete strips on either side to bring the road to (probably) 16 feet wide. The 9-foot-wide section clearly didn't work out all that well.
I would love to know when this 9-foot-wide concrete was poured.