At the fall 2021 meeting of the American Association of State Highway and Transportation Officials, Iowa submitted an application to change the route of Business US 151 in Cascade. The application starts on page 4 in this large PDF.
The change makes the business route begin and end on interchanges with US 151, and removes it entirely from Jones County. It also makes the “northbound” business route start by heading southeast on IA 136. The route becomes much shorter, but more than half of the eliminated segment is rural.
The existing BGSs on northbound US 151 — or at least those up in August — are large enough that “Business 151” signage could be pasted on without replacing the sign. That would be really convenient. However, I’ve been told that business route signage is local jurisdictions’ responsibility, so I don’t know what the protocol is here.
At the same meeting, AASHTO gave conditional approval to a new two-digit interstate, but it’s entirely within one state and not entirely built. Interstate 42 will run in the US 70 corridor in eastern North Carolina, from I-40 southeast of Raleigh to Morehead City on the Atlantic coast. Technically it’s “north” of I-40, because I-40 east of Raleigh practically runs north-south to Wilmington. There are many crimes against interstate numbering that AASHTO is letting North Carolina get away with (among them: I-73 is never going to be a thing, stop trying to make it a thing), but this isn’t one of them.