Quotulatiousness

May 9, 2016

QotD: Towards a theory of pedestrian behaviour

Filed under: Quotations, Randomness, Science — Tags: — Nicholas @ 01:00

One of the things I enjoy is urban running — i.e., running through the streets of cities. When we travel, this is one of my favorite ways to see cities, and it also helps me run further because I do not get bored. But trying to run through sometimes crowded pedestrian areas can be frustrating, since one is trying to move faster than the crowd and the crowd typically does not expect a runner coming up behind them on the sidewalk. As a result of many such runs, I have developed two laws of pedestrian behavior:

  • Groups of pedestrians will expand to fill the width of the space allotted. If the width changes, groups of pedestrians will respond very quickly and expand their group spacing to fill that width. While this behavior is almost certainly natural, it is almost impossible to distinguish a group walking naturally from one purposefully trying to block passage by a faster pedestrian. Corollary: Groups too small to fill the width of a passage or sidewalk will weave.
  • Groups of pedestrians, everything else being equal, will choose to pause and congregate at the bottleneck in any sidewalk, thus constricting an already narrow passage. DisneyWorld is a great location for spotting this behavior. Corollary: A disproportionate number of people will choose to stop right at the exit door from an jetway when exiting an aircraft.

Warren Meyer, “My Contributions to Social Science”, Coyote Blog, 2015-01-06.

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