1011.2.4 Openings.
Openings in the clear ground space surface shall not allow the passage of a sphere more than 1/2 inch (13 mm) in diameter.
Advisory 1011.2.4 Openings. Where possible, drainage grates should be located outside of the clear ground space surface. Elongated openings should be placed so that the long dimension is perpendicular, or as close to perpendicular as possible, to the dominant direction of travel.
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