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2013 Forest Service Outdoor Recreation Accessibility Guidelines (FSORAG)

4.6.4 Clear Floor or Ground Space.

The clear floor or ground space for telescopes and periscopes shall be at least 36 inches (915 mm) by 48 inches (1220 mm) positioned for forward approach to the telescope or periscope, and be located adjacent to an ORAR. Knee and toe clearance complying with ABAAS section 306 shall be provided under the telescope or periscope. Clear floor or ground space shall be positioned so that the eyepiece of the telescope or periscope is centered on the space.

drawing of man in wheelchair looking through telescope with dimensions inserted for requirements for knee and toe clearance

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