Signs are useful in providing information, identification and directions for travelers, but conventional signage is of little use to the blind or the visually impaired..
How can the same information be conveyed to the blind or the vision-impaired and how to ensure that the design and installation are identical from one country to the next?
To respond to these issues, ISO (International Organization for Standardization) has developed a standard giving specifications for tactile walking surface indicators (TWSIs) and recommendations for their installation. Now, for the first time, a common approach for TWSIs is available at the international level.
TWSIs are installed in public facilities, buildings used by many people, railway stations and on sidewalks and other walking surfaces. They are identified by raised tactile profiles and visual contrast to the surrounding or adjacent surface. TWSIs are detected by the blind or vision- impaired persons through the soles of their shoes and/or by a long white cane, and by the residual vision.
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