Why do people stand up before the bus or train stops?
Preparation often begins before movement ends.
The doors are still closed.
The vehicle is still moving.
Yet people begin standing.
At first glance, the behavior seems inefficient. However, the hidden mechanism is Shared Tempo. Public transitions happen quickly, and people prefer entering them prepared rather than surprised.
Standing early creates a small advantage. Bags are adjusted. Attention shifts. The body becomes ready before the environment changes.
Because many people follow the same rhythm, preparation itself becomes contagious. Sitting until the very end begins to feel unusual, even if it changes nothing.
The interesting part is that most passengers save only a few seconds.
But those seconds are not measured in time.
They are measured in the comfort of feeling ready before the world asks them to move.
