Hi ilias_
 I removed a turning circle because it didn't use
In the middle of the road but you can use mini_roundabout in this case
https://wiki.openstreetmap.org/wiki/Tag:highway%3Dmini_roundabout
but highway= turning_loop and highway= turning_circle used in end  of streets
https://wiki.openstreetmap.org/wiki/Tag:highway%3Dturning_loop
https://wiki.openstreetmap.org/wiki/Tag:highway%3Dturning_circle
Regards
nona mostafa
