Notes

Analyses, simulation studies, and commentary from the pedestrian dynamics community.

June 29, 2026 · 7 min read

Why do roaming crowds drift counterclockwise — and where?

A Nature Communications paper reports that freely roaming crowds drift counterclockwise. We rebuilt the experiment in simulation to test whether a slight individual left-turn bias explains it.

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June 12, 2026 · 4 min read

Why don't airlines board planes the optimal way?

The mathematically optimal boarding method has existed since 2008. We rebuilt the classic studies in JuPedSim to see why it stays on paper.

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