What-If Studio · Module 3 — School-Zone Exposure-Window Delta

Relative scenario deltas under fixed, banded demand — exposure & kinetic-energy proxies, not a crash prediction. No crash-history data is used anywhere in this module. crashstats.com.au family POC. ← Module 1

School frontage — demand band (proxy)

Band low (veh/day)

Band high (veh/day)

Zone length (km)

School days / yr

Baseline regime

Scenario regime

Street limit outside any zone (km/h) Window traffic weighting — peak factor: Child-presence factor during windows (proxy):

Demand fixedDelta-onlyBand rangesProxy metrics Method: window exposure = banded AADT × window share × presence × school days (presence-weighted vehicle transits), assessed inside a fixed 8:00–16:00 school-hours envelope so regimes with different windows stay comparable; kinetic energy ½mv² (1,900 kg reference light vehicle) at mean operating speed ≈ 0.92 × limit; child-pedestrian survivable impact speed ~30 km/h (Austroads AP-R560-18; ATC National Road Safety Strategy; WHO speed/severity curves). Statutory Victorian time-based windows 8:00–9:30 & 14:30–16:00 on school days. All demand-driven figures are shown as band ranges (never a single point) per the platform banded-exposure convention; band low of 0 means the low bound is unmeasured, not "no traffic".

Zone-covered school-hours traffic

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KE-weighted exposure index (proxy)

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Window KE vs 30 km/h reference

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Travel-time cost

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Honesty box. This tool moves exposure and kinetic energy, not crash counts, and touches no crash-history data. "Child-window exposure" is a stated proxy — banded traffic through the zone while children are assumed present — not a measured pedestrian count and not an outcome estimate. Converting any of these deltas into expected-casualty claims requires an EB/CMF evaluation design (separate, gated). Demand comes from the platform's static banded-AADT summary (measured or class-modelled 80% bands, taken as given — this platform family does not infer traffic volumes on the fly). Peak factor and presence factor are user-visible assumptions; drag them to stress-test the conclusion. Zone identification data: DTP Speed Zones open dataset (July 2026, CC-BY 4.0); windows per VicRoads school-zone rules.