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This study presents an experimental measurement of pedestrians' body rotationin bidirectional streams. A mock-up corridor monitored using a camera placed onazimuthal position is used to study pedestrians' behavior in unidirectional andbidirectional flows. Additionally, a commercial tablet is fixed on the chest ofsample pedestrians to examine their body rotation (or yawing) which cannot beobtained using position tracking alone. Angular velocity is recorded andsimultaneously stored in a central location using a wireless network, thusallowing the analysis of body movements with a high sampling rate and a limiteddelay. To investigate the influence of major/minor flow proportion (flow-ratio)on bidirectional streams two different situations were tested: the balancedconfiguration (with equal flows in both directions) and an unbalancedconfiguration (with different major and minor flow). Results clearly show thatunidirectional flow is more stable compared to the bidirectional case,requiring less time to cross the experimental section and showing a very smallamount of rotation during the whole experiment. Both bidirectionalconfigurations showed high values of body rotation, in particular during laneformation and dissolution. Finally, rotation directly measured on pedestrians'body was compared with the one obtained indirectly by analyzing pedestrians'trajectories. The comparison shows that, at least from a qualitative point ofview, both methods are in agreement, thus suggesting that even properties whichcan only be measured by motion sensing could be obtained indirectly through theanalysis of trajectories. Concluding, it has been suggested that while laneshelp smooth out bidirectional flows, larger instabilities are observed comparedto the unidirectional case. Lane separation and/or appropriate guidance aretherefore required.

Pedestrians rotation measurement in bidirectional streams