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American National Standards Institute
(ANSI)
This document provides information regarding the American National Standards
Institute (ANSI) standard for Detectable Warnings for Hazardous Areas
- A117.1-1986.
The
following sections of the standard are referenced:
Section
4.27.2 - Detectable Warnings on Walking Surfaces.
Detectable
warning textures on walking surfaces shall consist of exposed aggregate
concrete, cushioned surfaces made of rubber or plastic, raised strips
or grooves. Textures shall contrast with that of the surrounding surface.
Section
4.27.4 - Detectable Warnings at Stairs.
All
stairs, except those in dwelling units, in enclosed stair towers or
set to the side of the path of travel, shall have detectable warning
at the top of the stair runs. (The detectable surface shall extend across
the entire width of the staircase and for a continuous depth of 36"
(0.91m).
Section
4.27.5 - Detectable Warnings at Hazardous Vehicular Areas.
If
a walk crosses or adjoins a frequently used vehicular way, and there
are no curbs, railings or other elements detectable by a person who
has a severe visual impairment separating the pedestrian and vehicular
areas, the boundary between the areas shall be defined by a continuous,
detectable warning texture, which is 36" (0.91m) wide.
Due
to the fact that the American with Disabilities Act has "Reserved" this
section for detectable warnings for stairs and other similar potential
hazardous areas for later review, several states (i.e., Illinois, Connecticut)
have adopted this standard within their respective accessibility codes.
Johnsonite
Tactile Warning and Visually Impaired Tactile Warning Strips meet the
requirements of this standard.
Revision
4, Released August, 1999
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