I spent the weekend in Prague attempting to relax after a stimulating two days attending the 2015 Camo User Meeting. It really was great except for the main sights of the city being so crowded with tourists like me.
The traffic patterns vary greatly by the intermittent busloads of tour groups—big bunches of Japanese or Americans and other places worldwide that come to this wonderfully historic city.
It turns out that there’s a universal power law governing pedestrian interactions according to studies led by the Director of the University of Minnesota’s Applied Motion Lab Stephen Guy. He and his collaborators have developed a novel statistical-mechanical approach to directly measure the interaction energy between pedestrians. Using this simple interaction law they can simulate crowd phenomena such as two tour groups crossing a city square or trying to push into a just-opened attraction. See these situations and others illustrated in CGI movies here.
All I can think of when viewing these simulations is how horrible it is to get caught up in a crowd. The saving grace is you needn’t think much when this happens—just let your natural collision-avoidance system take over and go on auto-pilot.