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2013 Forest Service Outdoor Recreation Accessibility Guidelines (FSORAG)

405.9.2 Curb or Barrier.

A curb or barrier shall be provided that prevents the passage of a 4 inch (100 mm) diameter sphere, where any portion of the sphere is within 4 inches (100 mm) of the finish floor or ground surface. 

image demonstrating a curb or barrier provided that prevents passage of 4 inch (200 mm) diameter sphere where any portion of the sphere is within 4 inches of the finish floor

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