ISO 23599:2019 pdf download – Assistive products for blind and vision-impaired persons – Tactile walking surface indicators
1 Scope
This document provides product specifications for tactile walking surface indicators (TWSIs) and recommendations for their installation in order to assist in the safe and independent mobility of blind or vision-impaired persons. This document specifies two types of TWSIs: attention patterns and guiding patterns. Both types can be used indoors and outdoors throughout the built environment where there are insufficient cues for wayfinding, or at specific hazards. NOTE Some countries have adopted other designs of TWSIs based on the consolidated findings of science, technology and experience, ensuring that they can be detected and distinguished by most users. This document is not intended to replace requirements and recommendations contained in such national standards, regulations or guidelines.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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3.1 attention pattern
TWSI (3.16) design, calling attention to a hazard (3.9) only, or to hazards and decision points (3.4)
Note 1 to entry: Attention patterns can be installed in the vicinity of pedestrian crossings, at-grade kerbs (3.2),railway platforms, stairs, ramps, escalators, travelators, elevators, etc.
3.2 at-grade kerb
flush kerb
kerb whereby the edge of the walkway is at the same level as adjoining vehicular ways
Note 1 to entry: See Figures B.10 and B.11.
3.3 CIE Y value
tristimulus value Y of the CIE 1931 standard colorimetric system for reflecting objects
Note 1 to entry: The CIE Y value equals the percentage value of the luminous reflectance.
Note 2 to entry: Y = 0 denotes the reflectance (3.15) of an absolutely black object (no light is reflected). Y = 100 denotes the reflectance of a perfectly white object (no light is absorbed or transmitted).
3.4 decision point
intersection or change of direction along a path of travel defined by TWSIs (3.16)
3.5 discrete units
individual domes, cones or elongated bars that are embedded into the ground or floor surfaces
3.6 effective depth
distance between the detectable edges of the TWSIs (3.16) when measured in the principal direction of travel
Note 1 to entry: See Figure 1.
3.7 effective width
distance between the detectable edges of the TWSIs (3.16) when measured perpendicular to the principal direction of travel
Note 1 to entry: See Figure 1 and Figure 2.
3.8 guiding pattern
TWSI design, indicating a direction of travel or a landmark
Note 1 to entry: Guiding patterns can be used alone or in combination with attention patterns (3.1) in order to indicate the walking route from one place to another.
3.9 hazard
any area or element in, or adjacent to, a direction of travel, which potentially places people at risk of injury
3.10 illuminance
amount of luminous flux to a surface per unit area
Note 1 to entry: The SI unit for illuminance is lux (lx).
Note 2 to entry: See Reference [6] for further details.