what about some extreme ideas like a tunnel or elevated freeway?
A tunnel would be way too expensive, and still fairly disruptive - would probably end up with a cut-and cover design.
Given that elevated sections are under consideration for parts of the IL 53 parkway, I think it is more of an issue with the permit issuers
How did state owned highway land become an bird habitat?
I'd go with overzealous permit issuers again. It just looks like open fields that could easily be replaced elsewhere. I don't believe there are any endangered flightless birds in Illinois either that wouldn't relocate to a new area.
Can they route around it?
It does not appear so without requiring realignment of the freeway in Wisconsin. Even then, it looks like the same problems could easily sink any other alignment option.
Will this being cut down hurt the IL-53 / IL-120 work?
The IL 53 parkway is a completely separate project. ISTHA that IL 53 would be long done before any consideration of starting any tollway near Richmond - although given that on weekends WB IL 173 backs up from the US 12 intersection to the eastern boundary of Richmond, NB US 12 backs up from IL 173 to the railroad overpass north of the IL 31 intersection, and the IL 173 intersection with Wilmot Road develops quarter to half mile queues in all directions I would think ISTHA could have gotten some profits on a Super 2 starter tollway.
Although given the non-budging stance for wetlands on this corridor, I wouldn't be surprised if the IL 53 extension gets derailed again. Certainly will be interesting to see how the 66 corridor at the other end of the state fares.
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