Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Accessible Pedestrian Signal(also: APS, Audible Pedestrian Signal, Audible Traffic Signal)
- A device integrated into pedestrian signal systems at traffic intersections that communicates walk and don't-walk information to pedestrians who are blind or have low vision through audible tones, verbal messages, vibrotactile surfaces, or a combination of these. APS devices…
- Allocentric(also: Allocentric Reference Frame, World-Centred Reference Frame)
- A spatial reference frame in which locations and directions are defined relative to external landmarks or a fixed coordinate system, independent of the observer's own position or orientation. For example, "the shop is north of the park" or "there are two chairs side by side" are…
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