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Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finish floor or ground shall protrude 4 inches (100 mm) maximum horizontally into the circulation path.

EXCEPTION: Handrails shall be permitted to protrude 4 1/2 inches (115 mm) maximum.
Advisory 307.2 Protrusion Limits.  When a cane is used and the element is in the detectable range, it gives a person sufficient time to detect the element with the cane before there is body contact.  Elements located on circulation paths, including operable elements, must comply with requirements for protruding objects.  For example, awnings and their supporting structures cannot reduce the minimum required vertical clearance.  Similarly, casement windows, when open, cannot encroach more than 4 inches (100 mm) into circulation paths above 27 inches (685 mm).
Figure 307.2 Limits of Protruding Objects
A frontal view shows a person using a cane walking along a wall.  A wall-mounted object more than 27 inches (685 mm) from the floor protrudes no more than 4 inches (100 mm) from the wall surface.  An object overhead provides vertical clearance that is greater than 80 inches (2030 mm).

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