What determines crwod movement?

Interesting research although the result does not surprise me at all:

“So the researchers went looking for a new rule. They found it in a variable they called “time to collision,” which explained many of the course adjustments they observed. The closer two people get to colliding, the more energy they expend getting out of each other’s way. To be technical, they found that the interaction between individuals in a crowd could be described as 1 over the square of the time to collision: As a collision becomes more imminent, the energy you apply to avoiding it goes up drastically.”

http://www.bostonglobe.com/ideas/2014/12/14/crowds-human-particles-follow-laws-movement/S8Ec3cHorGAO4zPVkAeLWK/story.html

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