This is the first I've heard of these. I'd have to drive through one to really get a sense of it, but my first impression is that they'll confuse the hell out of most people. And they seem intended for interstates, which by definition get a lot of non-local traffic, so while locals may get used to them, the transient traffic which frequents them will still have to deal with the WTH factor.

It's definitely safer than a traditional diamond interchange, eliminating the left turns across traffic. I just wonder how much safer. With many safety features, there comes a point of diminishing returns, where the added safety is small enough to not be worth the negatives associated with them.

Here's my concern with this design (just based on the linked video): A traditional diamond forces left-turning traffic to turn across opposing traffic, leading to t-bone collisions. The DDI eliminates those collisions. But it also poses the danger of unfamiliar or distracted drivers bearing right at the signals, directly into oncoming traffic - which will cause head-on collisions. So, will the number of headers equal or exceed the number of t-bones that were prevented by the DDI?