The owner of the directory can list/navigate into it.
A member of the directory's group other than its owner can read and write it.
Any other user on the system can write and list/navigate into it.
Additionally the sticky bit is set, which means any sub-resources in this directory can only be renamed, moved, or deleted by their respective owners. Note that the sub-resources themselves may be viewed/edited/etc. depending on their own respective permissions.