Hi Nona Mostafa, isn't what you removed a turning circle? The wiki (https://wiki.openstreetmap.org/wiki/Tag:highway%3Dturning_circle)says "A turning circle is a widened area of road that allows vehicles to turn more easily" and "A turning circle may occur along a road instead of at the end".

This is indeed a widened area of road that allows vehicles to turn more easily, it just doesn't occur at the end of the road, but in a curve.