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I think it just is a regular two-lane roundabout? We have one of these nearby me in Cleveland, it works pretty well.

https://www.google.com/maps/place/41%C2%B027'58.2%22N+81%C2%...

This is a very elaborate version of the turbo roundabout, checking out streetview might help.

https://www.google.com/maps/place/Energieweg,+Nijmegen/@51.8...

The inside lane changes into the outside lane. This is usually done by traffic analysis. Meaning: it doesn't always immediately change the inside lane into the outside one. It works quite well for roundabouts with heavy uneven traffic (close to an Ikea :-P).

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