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Laboratory studies with pedestrians could depend strongly on Initial conditions. Comparisons of the results of such studies require to distinguish carefully between homoge neous and heterogeneous populations.
A series of well-controlled laboratory studies were performed with participants with and without impairments. Individual pedestrian movement through a corridor and a bottleneck of all participants was recorded by wide-angle HD-cameras and the trajectories of each participant was extracted automatically by using PeTrack.
This contribution shows that considering participants with impairments in laboratory studies of pedestrian movement is feasible and reports preliminary the inuences of movement. Preliminary analyses imply two main conclusions and a preliminary forecast: _rst, social behaviour in laboratory studies is considerately and respectful; we did not observe altruistic behaviour; but considerately behaviour may encourage a reduced capacity at bottlenecks. Second, technical devices to improve movement require space and reduce capacity.