 STARs can be very detailed (as is often the case in Europe), allowing pilots to go from descent to approach entirely on their own once ATC has cleared them for the arrival, or they can be more general (as is often the case in the United States), providing guidance to the pilot, which is then supplemented by instructions from ATC.Typically, European STARs are very runway-specific and allow approaches to be made without the controller needing to issue radar vectors frequently until short final.STARs published and used for United States air traffic tend not to have many deviations in waypoints per-runway, though they do have some.