EDIT: Changed subject line to match the name of the interchange. I left it misnamed below in my post
I was chatting with a friend who is a traffic engineer and he told me about a new type of intersection being implemented in the US. Currently, he says there are only two of these, one in MIssouri and other in Utah.
I believe he called it an 'inverse double diamond' or 'double inverse diamond' or something like that. It's a new way to improve traffic flow for a limited access freeway/highway with a lower volume roadway intersecting at a right angle. The interchange is for medium-volume traffic flow overall.
What's odd about it from a US-perspective is that on the non-freeway roadway, traffic direction is inverted under or above the freeway. That is, you are driving on the left for a distance until the other side of the interchange.
I just thought I'd drop this note because it looks interesting. I was thinking about mocking it up in a deserted area of Eastern Oregon which I am an AM of, just for visual sake so you could see how it works, but, just before posting this, I found it on the good ol' net. The Federal Highway Administration calls it a Double Crossover diamond
. Check it out!