This is a turning circle. It used to be the end of the road. The road has been extended, but the turning circle remains, and it is very useful as a turning point. I will reinstate it. Note that the OSM Wiki explicitly describes this situation https://wiki.openstreetmap.org/wiki/Tag:highway%3Dturning_circle
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/167320903
            