For car routing, I just saw, technically it is possibly to go around in a circle on the inner 4 paths of the crossing.
Why it should choose to to do that, I don't know. 
Only example I could find is, wanting to turn right, you could enter the "inner crossing" and turn left 3 times, and then you are able to continue onto the desired street.
Altough a router should choose to take the "outer crossing" for such a move ;)
Forced example:
https://www.openstreetmap.org/directions?engine=graphhopper_car&route=46.550827%2C6.624262%3B46.550206%2C6.624681#map=19/46.550797/6.625282&layers=N