Correlation between local radial speed and density gaps.

<p>(A) Local density maps for three representative replications with N = 30, 50 and 60 pedestrians. The emergence and the propagation of density peaks (red) and density gaps (blue) are visible. (B) Local radial speed for the same three replications, showing the lateral movements of pedestrians. The largest values occur mostly around density gaps. (C) Average local density as a function of local radial speed, for all replications with N = 30, 50 and 60 pedestrians. The largest values of occur where the local density level is low, that is, around density gaps. This correlation is less visible for N = 30, probably due to the lower global density level.