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Main factor causing "faster-is-slower" phenomenon during evacuation: rodent experiment and simulation.

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Crowd flow at bottlenecks, like exits, can be optimized. Research shows controlling agent velocity variation, not just speed, improves evacuation efficiency and prevents the faster-is-slower effect.

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Area of Science:

  • Physics
  • Social Sciences
  • Engineering

Background:

  • Understanding crowd dynamics at bottlenecks is crucial for emergency preparedness and accident prevention.
  • Pedestrian flow research often observes counterintuitive phenomena like the faster-is-slower effect.

Purpose of the Study:

  • To analyze crowd evacuation through a narrow exit with guide-walls.
  • To investigate the factors contributing to the faster-is-slower effect in crowd dynamics.
  • To identify methods for optimizing evacuation efficiency.

Main Methods:

  • Utilized the discrete element method (DEM) for crowd simulation.
  • Integrated physical and psychological modeling with empirical rodent experiments.
  • Analyzed evacuation data from both simulations and real-world experiments.

Main Results:

  • Confirmed the faster-is-slower (FIS) effect in simulated and rodent crowd evacuations.
  • Observed that increasing guide-wall angle promotes lane formation and faster evacuation despite lower agent velocity.
  • Identified the standard deviation of agent velocity as a critical factor in the FIS effect.

Conclusions:

  • Ordered crowd movement, facilitated by guide-walls, leads to more expeditious evacuation.
  • The FIS effect can be mitigated or eliminated by managing the standard deviation of agent velocities.
  • Controlling velocity variability is key to enhancing crowd flow efficiency in emergency situations.