I caught this on Fortune this morning. (Warning, autoplay video with sound in the link).
New "Diverging Diamond" Intersection Cuts Accidents by Sixty Percent - Fortune
There are a few in the US with more being planned. It seems to be a good idea as it cuts down on accidents. I do have a bit of a concern regarding confused drivers who do not know what to do when they encounter one.
A different video explaining the concept.