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Elucidating emergent regularities in intriguing crowd dynamics is afundamental scientific problem arising in multiple fields. In this work, basedon the social force model, we simulate the typical scenario of collectiveescape towards a single exit and reveal the striking analogy of crowd dynamicsand crystallisation. With the outflow of the pedestrians, crystalline orderemerges in the compact crowd. In this process, the local misalignment andglobal rearrangement of pedestrians are well rationalized in terms of thecharacteristic motions of topological defects in the crystal. Exploiting thenotions from the physics of crystallisation further reveals the emergence ofmultiple fast tracks in the collective escape.

Ordering leads to multiple fast tracks in simulated collective escape of human crowds