015_white in the dark

if someone is going blind, i'd recommend the person to move to tokyo. here in tokyo city, we can find the relief texture (braille) on walkways, public phones, cans of beer, subway ticket machines, etc., etc. furthermore, in the picture, they also have street crossing signal for the blinds, the white one. but i just wonder how the blind people know which the white one is. i guess it's more for us to press for them.