KNISCO INCLUSIVE ACCESS

  Luminance contrast is the difference in the amount of light reflected from one surface compared to the amount of light reflected from another surface. 

Luminance contrast is calculated with Bowman-Sapolinski equation:

C = 125 (Y2 − Y1)/(Y1 + Y2 + 25) 

where Y1 and Y2 are the luminous reflectance values (LRV) of the two surfaces.

Definitions: 

Tactile ground surface indicator (TGSI)

  Truncated cones and/or bars installed on the ground or floor surface designed to provide pedestrians who are blind or vision-impaired with warning or directional orientation information.

Integrated tactile ground surface indicators (Integrated TGSIs)  

TGSIs that are in a defined pattern and which are of the same luminance and material as the base surface.

Discrete Tactile Ground Surface Indicators (Discrete TGSIs)

TGSIs that are individually installed, which provide the same luminance for the sloping sides and upper surface of the truncated cone.

Composite discrete tactile ground surface indicators (Composite

Discrete TGSIs)

  TGSIs that are individually installed and which provide a differing luminance for the sloping sides and upper surface of the truncated cone.