"Highway 6 South" is not a valid name, neither is "State Highway 6 South".  These are refs, specifically called out in the wiki guidelines about names as being invalid.  The official name would be the correct entry for name in this case.  Where a highway has no name, only a number, then noname=yes would be appropriate.  Duplicating the ref value in name is never the correct name value.
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/165747728
            