Why a Sudden Stop Disrupts a Sidewalk
A busy sidewalk works less like a queue and more like a moving stream: people choose their paths moment by moment, watching the space ahead and adjusting to others. When someone stops without warning, those behind have little time to react. They may brake, step sideways, or squeeze into a neighboring path, forcing more people to adjust in turn.
The Ripple Effect of a Small Obstacle
The person taking a selfie may occupy only a little space, but the disruption can spread beyond that spot. On a narrow or crowded walkway, there may be no clear route around them. A brief pause can make pedestrians bunch up, collide, or lose the steady pace they were keeping. Frustration often comes less from the photo itself than from having to make a sudden detour with little room to do so.
Step Aside Before You Stop
Moving to the edge of the walkway before taking a picture keeps the main path open and gives others a predictable route. That matters most where foot traffic is dense: one person can pause safely, but an unexpected stop in the stream makes everyone nearby do extra navigation.
