Crowd Management
Crowd Management tests how crowds behave and how density, flow and exits are controlled so that a gathering does not turn into a crush.
Crowd dynamics
- A dense crowd behaves like a fluid: pressure builds from behind and is transmitted forward, so a person can be held upright with their feet off the ground.
- Density guide: up to about 2 persons per m² is comfortable; around 4–5 per m² movement becomes uncontrolled; above that, crush injury and asphyxiation risk rise sharply.
- Crush, not panic, kills most victims: people are compressed against barriers or fall and are trampled.
- Progressive crowd collapse: one stumble creates a wave of falls.
Control measures
- Separate entry and exit, use one-way flow and holding areas with metered release.
- Count people in and out; never exceed the venue's safe capacity.
- Keep emergency exits clear, unlocked, lit and signposted; no barricade may block an exit.
- Use barricades, queuing lanes, PA announcements, signage and trained stewards at pinch points - gates, stairs, narrow bridges, ticket counters.
- Watch for triggers: rumour, a fallen barrier, rain-slippery ground, sudden celebrity movement, a gate opening unexpectedly, a power cut.
- If density rises: stop inflow, open relief exits, make clear authoritative announcements, and never push back against the crowd - you will be flattened.
Worked example
At a religious gathering the front row is pressed against a barricade and a rumour spreads that a gate has closed. Reasoning: density is already high, and rumour is a known trigger for a surging movement. Correct action: stop further entry, open a side exit, announce clearly over the PA that the route is open, and move stewards to the flanks rather than the front.
Traps that cost marks
- Opening all gates at once without direction, which creates opposing flows.
- Counting tickets sold instead of people actually present.