Around 90 % of the global exchange of goods takes place via the world's seas and ports, and these work like a global marshaling yard that acts as a buffer for other logistics chains. Even if just one part of this network is disrupted, a domino effect is created. In 2020 and 2021, this included the closure of Chinese ports due to the coronavirus, the grounding of the "Ever Given" in the Suez Canal, and the differences in the recovery times of the world's economies. The sudden growth in demand from Western economies resulted in a one-way flow of goods from China, while demand in the opposite direction remained low and consequently disrupted container traffic and shipping. The consequence: a lack of containers, higher logistics costs, a need for more space in ports, and longer jams. Almost all over the world, large container ships are backlogged outside ports, waiting to be loaded or unloaded. The problem, however, is not that handling capacities are insufficient, but that the port storage areas are overfilled. One indicator of this is the so-called dwell time of containers in a port.