motion resembles a random walk. Since there are many particles in the system most of them will compete for empty sites with other particles crossing their path anywhere in the room. In the ordered regime all pedestrians gather around the exit quickly with most of them standing in the cue without competing [^3]. Even though the number of conflicts is smallest in the ordered regime, the influence of the friction parameter on the evacuation time is strongest. The reason behind this is that nearly all conflicts take place in front of the door. Therefore they have a direct effect on the outflow which is reduced considerably. Conflicts arising away from the exit do not have a direct influence on the evacuation time. In fact they can even lead to an increased outflow because they might surpress clogging at the door (see Sec. \[sub\_column\]).

![Conflict density in dependence of time $t$ for all three regimes ($\rho=0.3$ and $\mu=0$).[]{data-label="plot_12"}](\DIR/fig21.eps){width="0.8\columnwidth"}

![Same as fig. \[plot\_12\], but with $\rho=0.3$ and $\mu=0.9$.[]{data-label="plot_12b"}](\DIR/fig22.eps){width="0.8\columnwidth"}

In figs. \[plot\_12\] and \[plot\_12b\] the corresponding conflict densities, i.e. the number of conflicts divided by the number of particles inside the room, are shown. In fig. \[plot\_12\] one can see a very strong 