Many people are drawn to the Harz Mountains, the Ore Mountains or the Thuringian Forest during their vacations. Tourism organizations there advertise guest cards that promise free bus and train travel or discounts. According to Sven Groß, Professor of Tourism Research at the Harz University of Applied Sciences, although these offers are a successful model that has been expanded over the years, they often do not reflect the entire vacation region from the guest's perspective.
From a scientific point of view, it makes sense to cut guest cards along a tourism region and less along district and state borders. However, the legal structure, financing and agreement with the transport companies involved often caused difficulties.