From CityLab — "Simple and Universal Law Governing Pedestrian Behaviour"

Big city sidewalks can feel like an inexplicable dance of elbows and shopping bags and baby strollers and pigeons and texting. But a group of crowd scientists has whittled the chaos to its core and found that, far from unpredictable, foot traffic follows a mathematical formula elegant for its simplicity. From Shibuya Crossing to Times Square we're all performing invisible calculus: computing other people's speeds and trajectories and adjusting our own accordingly. More at: University of Minnesota Researchers Propose a "Simple and Universal Law Governing Pedestrian Behavior" - CityLab