Changes

People who have the transferable monthly ticket ''RegioKarte Übertragbar'' can take along another adult on Sundays and holidays. Students (maybe only students in Germanyor Freiburg uni?) don't pay after 19h30 on buses trams and trains, and on Friday and Saturday, there are trams running all night. It does not include night buses. Even so, controllers are not seen so often. Are they lurking somewhere?