The standards for creating braille suitable for signage have evolved away from those for paper. There is no one “standard” for braille on signage. Many states have created their own specifications as part of their state building codes; and, while braille size and spacing requirements are part of the Americans with Disabilities Act (ADA), updated standards, based on the International Building Code, have been in process for nearly fifteen years. More detail on the most common standards and their origins is provided below.