Bicycle Dutch has more info on the technical specs and the history of the Hovenring. Here is a quote about the project:
“The area is full of new housing with a lot of children and especially for those kids cycling to school, the new situation is far better. Now, both types of traffic are completely separated in time and also in place, so cyclists can pass this large junction safely and without stopping.” From Bicycle Dutch.
Safe cycling infrastructure is important for getting more people on bikes. This might be an extreme example but it is definitely inspirational.