While the western (and especially nordic countries) social etiquette already marks an unwritten physical distancing between unkown people interacting as being the length of the hand, the context of the Covid days points this type of approach as a global must, either in exterior or inside spaces where groups of people interact. But the correct physical distance from our fellows, in order to stay safe from the virus, is quite a provoking and hard to control thing to manage.
Just What We Need