Environmental Flow

The ordered changes in a pedestrian's distances and directions to surrounding objects that occur while walking, providing continuous feedback about spatial position and movement through the environment. For sighted people, environmental flow is primarily visual (optic flow), but blind pedestrians rely on auditory flow (changes in sound reflections and echoes), tactile flow (air movement, ground surface changes), and thermal flow (temperature variations near buildings or open spaces). Maintaining awareness of environmental flow is critical for spatial orientation and wayfinding, and disruptions to this flow — such as open intersections where auditory landmarks disappear — create significant challenges for blind pedestrians.