@monkeyben @thibaultmol @anne_twain @raboof @cargot_robbie
This was an interesting enough point to type into a search engine, so:
ISO 17049:2013 which stands for Accessible design -- Application of braille on signage, equipment and appliances
and
The Americans with Disabilities Act requires most permanent signs in buildings to have tactile (raised) letters, along with Braille printing
and
AU's National Construction Code - 2022
- S15C2 Location of braille and tactile signs
https://ncc.abcb.gov.au/editions/ncc-2022/adopted/volume-one/d-access-and-egress/15-braille-and-tactile-signs
... all cover the placement of braile signs.
These rules include provisions for making the signs well lit and high enough contrast to be located by those with some vision.
Locating doors themselves is covered under D4D9 Tactile indicators