Computer simulation of a densely crowded area with the heuristic pedestrian model of Ref.(figure from the Supporting Information) . Orange and red areas indicate the locations with the highest crowd pressure, when a densely packed crowd tries to move around the corner. The simulated situation is analogous to leaving visitor streams at the Love Parade in Duisburg, trying to leave the main ramp through the tunnel in the West. Note, however, that the above simulation does not consider inflows of visitors arriving from the East. These would move the high-pressure area a bit up the ramp, where the accident actually happened.