This piece of bicycle infrastructure seems like it comes from a dream world, if the Netherlands is such.
The Hovenring is a suspended bicycle roundabout, floating above the major roundabout outside Eindhoven, Netherlands.
It was officially opened with a community party in June. The intention was to remove the problematic contact points between motor traffic and bicycles (and pedestrians) where the previous separated bicycle lanes were channeled into crosswalks.
This post at the blog bicycledutch, gives details about heights, gradients and other data for those who want to know more. The post does not, however, include the formula for convincing North American planners to Think Big.