Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Tactile Dome(also: Truncated Dome, Detectable Warning Surface)
- Small raised bumps arranged in a grid pattern on ground surfaces to provide a tactile warning of an upcoming hazard, such as a curb edge, train platform edge, or street crossing. Tactile domes are part of the broader category of tactile walking surface indicators and are…
- Tactile Paving(also: Tactile Ground Surface Indicators, TGSI, Detectable Warning Surface)
- A system of textured ground surface indicators installed on footpaths, train platforms, and building floors to assist pedestrians who are blind or have low vision with navigation and hazard detection. Tactile paving typically uses two patterns: raised dots (truncated domes) to…
- Tactile Signage(also: Tactile Signs, Touch-Readable Signs)
- Signs designed to be read by touch, typically featuring raised lettering, Braille text, or tactile symbols. Required in many jurisdictions under accessibility legislation such as the Americans with Disabilities Act (ADA), tactile signage is placed at standard locations like room…
- Tactile paving(also: Tactile ground surface indicators, TGSI, Detectable warning surface)
- A system of textured ground surfaces installed on footpaths, transit platforms, and pedestrian crossings to provide navigational cues to people with visual impairments through the sense of touch underfoot or via a white cane. Standardised patterns include raised dots (warning of…
- Talking Lights
- Talking Lights is a commercial location-signalling system that modulates ordinary fluorescent light fixtures to transmit an inaudible digital signal, which a hand-held receiver carried by a blind user decodes into spoken information about the current location (for example, a…
- Transit accessibility(also: Public transportation accessibility, Accessible transit)
- The degree to which public transportation systems — including buses, trains, subways, and associated infrastructure like stops, stations, and information systems — are usable by people with disabilities. Transit accessibility encompasses vehicle design (ramps, priority seating,…
- Travel Chain(also: Mobility Chain, Journey Chain)
- A travel chain is the complete sequence of connected stages that make up a journey from origin to destination, including planning, leaving the starting point, walking to transport, using public transport, navigating outdoor environments, entering buildings, and finding specific…
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