The interchange is a diverging diamond:
As I would have noted if I could comment on his site conveniently, Springfield actually has two of the crazy things. I’ve been through both of them (the aforementioned one is on the way to Bolivar, which strangely enough rhymes with Tolliver in Missoureese) and this one is on the south side of town nearer where I live:
This second one has a particularly wicked jog before and after the crossover which easily leads the inattentive to veer into the rightmost lane.
What, we’re progressive trafficly speaking here in Southwest Missouri. We even have a roundabout:
All roads leading into that roundabout have speed limits of 50 miles per hour.
Frankly, I think some traffic engineer in southwest Missouri is burnishing his portfolio so he can get a job doing some traffic engineering somewhere else.