Objects that protrude into paths of travel can be hazardous to people with vision impairments or other disabilities. Common examples include drinking fountains, shelves, sconces, signs, and kiosks.The ADA standards set placement specifications on objects like these to help ensure people with disabilities can safely and appropriately navigate from one destination to another. 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 Protruding Objects, please visit https://www.access-board.gov/ada/guides/chapter-3-protruding-objects/
For more information on other standards, please visit the Guide to the ADA Standards section of the United States Access Board website.