The DOT had a public meeting June 23 about long-term plans to convert US 30 between Boone and the Lincoln Way exits into a full freeway. This is in keeping with plans to do the same on 30 between Ames and Nevada, and on US 218 between Janesville and Waverly. It’s also likely the follow-up to a meeting in 2019.
There are three potential interchange locations (PDF): The four-way stop at Story Street on the south side of Boone, R27 southeast of Boone, and V Avenue west of Lincoln Way. Those three exits and what looks like a complete set of frontage roads on both sides would replace 11 at-grade intersections. That includes a couple intersections that have already been modified to eliminate some traffic movements.
Since late 2010, Story Street has been the only place US 30 traffic must come to a full stop between Jefferson and Mount Vernon, and since 2019 it’s the only place between Jefferson and Clinton. The United school is one of two places I know of with a “School Speed Limit When Flashing” of 55 mph, and the other is at Colo.
Conversion to a full freeway would be very expensive and take a long time.