If you view the Mapillary image here you can see a driveway/curb cut that appears to be for the purpose of turning around, assuming you were going South on the two way before it turns into a one way. I don’t know the legal ownership or access of this drive, but it does not seem to lead anywhere, except maybe for working on the highway above (?). Should I map this as a driveway or generic service road? Or something else? And is there a way for me to tag it to represent that it could be used to turn around?
I’d think just a service road.
None of the options for Tag:highway=turning_circle - OpenStreetMap Wiki really apply though, so I wouldn’t add them.
I would delete this
Hope that helped