Crowd Density Grade

Crowd Density Range

(Indoor; Outdoor)

Status Description

I

di ≥ 2.8; do ≥ 3.8

Higher Security risk; serious emergency

II

1 ≤ di < 2.8; 1.33 ≤ do < 3.8

Overcrowding; too dangerous

III

0.54 ≤ di < 1; 0.72 ≤ do < 1.33

Interaction; congestion sprouts; controllable

IV

di < 0.54; do < 0.72

Crowds move freely, slowly, and smoothly