Figure 4.
The 4 plots map congestion intensity across the waiting hall, with X and Y axes in metres. At 73 minutes, low congestion appears around X 20 to 40 metres and Y 15 to 55 metres. At 78 minutes, congestion intensifies and extends roughly from X 20 to 55 metres, with the strongest area near the upper gates. At 85 minutes, the congested region becomes stronger and extends vertically between the upper and lower gates, concentrated around X 25 to 50 metres. At 100 minutes, the congestion shifts and broadens towards X 35 to 80 metres, with the strongest intensity around X 50 to 65 metres. The intensity scale ranges from 0 to 1.Heat maps of congestion intensity at different time instants