such traffic signs (Germany) with dots:
The three black dots therefore have nothing to
do with Braille - and there is no carrying
order depending on the disability!
Meaning of the sign with the
three black dots is simply just a
conspicuous marking of people
who may pose a danger on public roads
because of their disability. Similar to the black
and yellow striped markings of danger spots in public.
Today, the stereotypical symbol of the three black dots
should be advantageously replaced by a triangle
symbol (meanings V for right of way or A for
attention) as traffic-safety-sign for all:
(Conceivable is the use of
symbols on protectors or the like.)