The German Alpine Club, the Deutscher Alpenverein (DAV), has more than 1.3 million members. It keeps statistics on their mountain accidents. One category is the Blockierung, the blockage. It covers emergencies in which climbers or hikers are not hurt but must call mountain rescue, for example because they are lost or too exhausted to go on. In August 2020 the DAV wrote that blockages lassen sich durch eine präzise Selbsteinschätzung und akribische Tourenplanung relativ gut vermeiden, can be avoided quite well through precise self-assessment and meticulous tour planning. It appealed to mountaineers to prepare especially carefully for their tours and to plan defensively.