ISO 23599:2019 pdf free
ISO 23599:2019 pdf free.Assistive products for blind and vision-impaired persons一Tactile walking surface indicators
The top diameter of truncated domes or cones shall range from 12 mm to 25 mm, as shown in Table 1,and the bottom diameter of truncated domes or cones shall be (10±1) mm greater than the top diameter (see Figure 1).
NOTE Systematic research[32][33] carried out on truncated domes or cones of various dimensions indicates that a top diameter of 12 mm is the optimal size for blind or vision-impaired persons to detect and distinguish through the soles of their shoes. Experiences indicate that the optimal top diameter for other groups within the community could be greater.
The spacing refers to the shortest distance between the centres of two adjacent truncated domes or cones which can be parallel or diagonal at 45° to the direction of travel. The spacing shall be within the ranges shown in relation to the top diameter in Table 1. The tolerance of the top diameter shall be±1 mm.Difference in colour or tone between TWSIs and surrounding or adjacent surfaces may be used to increase detectability.
Combinations of red tones and green tones shall be avoided because the most common colour deficiency is of the red-green type.
NOTE 1 Vision-impaired persons often have deficient colour vision. They can, however, retain luminance sensitivity even when colour sensitivity is severely decreased.
NOTE 2 Safety yellow, as defined in ISO 3864-1, has the best colour conspicuity (according to research into vision-impaired persons[45][48][49]).
For safety considerations, minimum depth and width dimensions for installation of TWSIs might need to be greater than those specified in this document, because greater depth and width dimensions increase the probability of detection.
When TWSIs are embedded as integrated units, the base of the TWSIs shall be level with the surrounding or adjacent surface. When integrated units are applied on top of existing surfaces, the maximum height of the base plate shall not exceed 3 mm and the TWSIs shall have bevelled edges (see Figure 5).ISO 23599 pdf free download.
