A bus has several empty rows. You board, scan the seats, and take one where nobody is beside you. The decision takes a second and may feel purely practical. Yet it carries a message that most fellow passengers understand: we can share this vehicle without sharing a personal space unnecessarily.
A study of bus seating found a norm of selecting an unoccupied pair of seats rather than taking a place beside a stranger when that option was available.¹ The obvious benefit is room for bodies, bags and movement. The less obvious one is social: choosing distance helps both people manage a journey without having to negotiate a close encounter.
The space immediately around you
A carriage can be half empty and still feel crowded if someone sits directly against you. Research with urban train commuters found that the density of people close to a passenger mattered more for several measures of stress and perceived crowding than the overall density of the carriage.² In other words, “how full is this train?” and “how much space do I have?” are different questions.
A seatmate changes more than elbow room. You may need to avoid brushing arms, adjust where you look or worry about disturbing the other person when you leave. The same calculation applies to them. Taking an empty pair of seats removes many tiny decisions for both passengers.
That does not make a fixed distance biologically mandatory. What feels comfortable varies between people and situations. A commuter with a large bag, a passenger travelling with a friend and somebody needing an accessible seat may all choose differently. The point is that, when all else is equal, a free adjacent seat is an easy way to lower the social and physical demands of the journey.
Politeness without conversation
Sociologist Erving Goffman used the term “civil inattention” for a familiar public behaviour: briefly acknowledging another person’s presence, then withdrawing focused attention. Later research describes it as a way for strangers to share public space while preserving a degree of privacy.³ A bus is a good setting for it. People are near one another for a while, but most have not agreed to socialise.
Choosing an empty row can be one small part of that courtesy. It says, in effect, “I know you are here, and I am giving you room.” The norm is not a formal rule on a sign. It is learned by watching how other passengers behave, noticing reactions and adapting to a particular setting. Research on long-distance bus travel describes travellers’ ways of maintaining temporary social disengagement while sharing space.⁴
There is a useful difference between leaving someone alone and ignoring their needs. Civil inattention cannot mean refusing to notice a person who needs a seat or assistance. Nor does someone who sits nearby necessarily intend to intrude. They may have a reason invisible to you: a safer-feeling part of the vehicle, an easier exit, a view of the next stop, or a seat away from a draught.
The design of the vehicle also shapes the decision. Paired forward-facing seats offer a small, obvious boundary: an occupied pair and an empty pair look like different choices. Bench seating, facing seats or a narrow aisle change the distances and sightlines. A passenger who avoids one seat may be responding to the layout rather than to the person nearest it. This is one reason observations from a particular route should be read as evidence about behaviour in context, not a law of human nature.
Why the choice can feel loaded
Suppose a bus is almost empty and a stranger chooses the seat directly next to you. Nothing about the seat itself is forbidden. Yet the choice can be surprising because it breaks the expected pattern. When many equivalent spaces were available, proximity seems deliberate, and the seated passenger may wonder why. This is an inference about social meaning, not proof of the newcomer’s intention.
The same behaviour reads differently as the bus fills. When no empty pairs remain, sitting beside someone becomes ordinary. Passengers adjust bags and make room because the situation now explains the choice. The unspoken rule is conditional: spread out while there is space, then share fairly when there is not.
Personal safety can sharpen the calculation, too. Some passengers have good reasons to be more alert to unwanted attention or harassment. A vacant row may offer greater control over distance and movement. That experience cannot be reduced to a universal preference for solitude, and the research on seating should not be used to tell individuals what level of closeness they ought to tolerate.
One more distinction matters. Avoiding an unsolicited seatmate does not prove that people dislike all contact with strangers. In experiments on buses and trains, people who were asked to talk to a stranger often reported a better experience than those who remained disconnected, despite expecting otherwise.⁵ A welcome conversation under one set of conditions is different from unexpected physical proximity under another.
Seat choice is therefore a remarkably compact social decision. A person considers comfort, the vehicle’s layout, who else needs space and what their choice might signal. Often the easiest solution is an empty pair of seats. Two strangers get a little more room and a little less to negotiate, while still travelling together in the same public place.