The dimension Uncertainty Avoidance has to do with the way that a society deals with the fact that the future can never be known: should we try to control the future or just let it happen? This ambiguity brings with it anxiety and different cultures have learnt to deal with this anxiety in different ways. The extent to which the members of a culture feel threatened by ambiguous or unknown situations and have created beliefs and institutions that try to avoid these is reflected in the UAI score.
At 92 Japan is one of the most uncertainty avoiding countries on earth. This is often attributed to the fact that Japan is constantly threatened by natural disasters from earthquakes, tsunamis (this is a Japanese word used internationally), typhoons to volcano eruptions. Under these circumstances Japanese learned to prepare themselves for any uncertain situation. This goes not only for the emergency plan and precautions for sudden natural disasters but also for every other aspects of society. You could say that in Japan anything you do is prescribed for maximum predictability. From cradle to grave, life is highly ritualized and you have a lot of ceremonies. For example, there is opening and closing ceremonies of every school year which are conducted almost exactly the same way everywhere in Japan. At weddings, funerals and other important social events, what people wear and how people should behave are prescribed in great detail in etiquette books. School teachers and public servants are reluctant to do things without precedence. In corporate Japan, a lot of time and effort is put into feasibility studies and all the risk factors must be worked out before any project can start. Managers ask for all the detailed facts and figures before taking any decision. This high need for uncertainty avoidance is one of the reasons why changes are so difficult to realize in Japan.