Public transport is usually understood as infrastructure: routes, schedules, capacity. Ethnographers who ride the same bus line for months at a time see something else — a recurring social world with its own etiquette, hierarchies, and small rituals of civility among strangers.
Seating arrangements, for instance, encode unwritten rules about who yields to whom, and those rules shift by time of day, route, and city. The same seat that is fiercely defended during a rush-hour commute is freely offered to an elderly passenger an hour later.
Transit also compresses social distance in ways few other public spaces do. Commuters who would never otherwise interact are pressed into shared physical space for the length of a ride, producing brief, dense encounters across class and background that researchers have used to study urban tolerance, conflict, and cooperation.
Because a transit route repeats daily, it also offers something rare in fieldwork: a controlled, comparable setting where the same social scene can be observed, morning after morning, until its patterns become legible.