What is ADA?

ADA is a law (The Americans with Disabilities Act) which was enacted
in 1992. Its purpose is to provide people with disabilities easy access
to public buildings, services and employment

All interior signs which identify permanent rooms or spaces must
conform to the law. The law states that these signs must have
raised upper case characters accompanied by Grade 2 braille. If
symbols or pictograms  are included are included on these signs,
the space for the pictogram is also regulated.

The greatest effect, by far, of this regulations has been on facilities
such as office buildings, health care facilities, educational institutions
and hotels where there are many rooms or suites. Each of these
spaces must be designated with a raised character and braille
identification sign installed in the proper location.