A frontier proposal with a validation plan, not an implemented detector.
Intended capability
Research whether the field could support this proposed outcome: Detects the transition from dense-but-flowing crowd to dangerous compression at venue chokepoints: density climbing while per-person motion variance collapses — the crush precursor signature — minutes before injuries.
This describes the intended outcome. Readiness is research concept, evidence is class C, and a catalog mapping or recording is not proof of this outcome at a real site.
Solution blueprint
See the environment before installing it.
This exact kit is one of 191 first-class designs. It includes geometry, objects, nodes, wording, scenarios, installation, limitations, and catalog-bound readiness.
No rendered revision is available yet.
Bundled recording
A related Frontier scene
This is one recorded vertical scenario. It is not separate validation of every capability in the catalog.
01 The physics
Crush dynamics have a known signature: density rises (aggregate perturbation and mode count up) while individual mobility collapses (velocity variance and high-band energy down) and slow pressure waves appear (<0.5Hz coherent sway). Each component is separately observable in CSI; the compound is the alarm.
02 Shared processing path
Eigen-mode crowd_index + edge velocity-variance moments per chokepoint link cluster -> compound risk score (density up AND mobility down AND sway band coherent) -> staged alerts to crowd management with the raw components always visible.
This is a capability design path. Components may be shared with other catalog entries; it is not presented as a unique algorithm.
03 Validation plan
Cannot be validated on real crushes; validate components separately (density r=0.9 lineage, mobility collapse in staged dense-queue drills with safety officers) and the compound score against historical bottleneck simulations. Deploy only as advisory alongside existing measures.
04 Commercial hypothesis
For event safety: 'A physics-based compression precursor at every chokepoint — advisory minutes when they matter.'