2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017

11B-302.3 Openings.

Openings in floor or ground surfaces shall not allow passage of a sphere more than ½ inch (12.7 mm) diameter except as allowed in Sections 11B-407.4.3 _|Platform to Hoistway Clearance|_, 11B-409.4.3 _|Platform to Hoistway Clearance|_, 11B-410.4 _|Platform to Runway Clearance|_, 11B-810.5.3 _|Platform and Vehicle Floor Coordination|_ and 11B-810.10 _|Track Crossings|_. Elongated openings shall be placed so that the long dimension is perpendicular to the dominant direction of travel.  

FIGURE 11B-302.3
ELONGATED OPENINGS IN FLOOR OR GROUND SURFACES

 Advisory 11B-302.3 Openings. Elongated openings, like those of most grates, must be oriented so that the long dimension is perpendicular to the dominant travel direction. In locations where there is no dominant flow pattern, openings should be limited to ½” in both dimensions. Where an accessible route is available to bypass openings completely, they can be oriented in any direction. ◼