- Protruding Objects: Some people who are blind or have low vision use canes to detect objects along a route. One element of a barrier-free meeting space for participants who are blind or have low vision requires cane-detectable protruding objects and sufficient head clearance. Wall-mounted objects, with bottom edges between 27 inches and 80 inches above the floor, cannot protrude into the route more than four inches. The route through the meeting space must be free of overhanging objects that are less than 80 inches above the floor.
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