The ADA standards include requirements for informational and directional signs that must meet specific requirements for visual and tactile legibility. These signs apply to accessible parking spaces, accessible entrances, and restrooms, among many other locations. In an effort to help clarify the standards, the United State Access Board has created an animated video (below) that explains them in context and how they are beneficial in everyday life.
For more information on this and other standards, please visit the Guide to the ADA Standards section of the United States Access Board website.