I live in Bloomington, and while I don't normally monitor highway departments, I plugged in 156.1800 last night to check for you.
I heard quite a bit of what sounded like data. Certainly could have been NXDN or MotoTRBO or another digital mode, though I don't have proper equipment to tell what type. The only analog signal I heard was a fast CWID.
Hope that helps someone.
Kevin
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