In NY u-turns aren’t illegal but if there’s a sign “no uturn” you might get a ticket.
Sounds like a trap/nothing else to do thing by the coppers.
The other item you may want to check is the Illinois day limitation for a speedy trial. Some courts get overbooked and set the court dates past the expiration date.
Florida’s speedy trial limit is 45 days and an “Unsafe U-turn” ticket is $121. [sly]