Imagine that you are French. You are walking along a busy pavement in Paris and another pedestrian is approaching from the opposite direction. A collision will occur unless you each move out of the other’s way. Which way do you step?
Understanding and modelling how pedestrians behave is a youngish field for researchers. Anticipating pedestrian flows makes crowd events smoother and safer, and accounting for the peculiar propensities of different nationalities is key to getting it right.

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