Except as provided in 403.5.2 and 403.5.3, the clear width of walking surfaces shall be 36 inches (915 mm) minimum....
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403.5.1 Clear Width
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1005.2.1 Height
At least 25 percent of the railings, guards, or handrails shall be 34 inches (865 mm) maximum above the ground or deck surface....
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1009.5.4 Transfer Steps
The surface of the bottom tread shall extend to a water depth of 18 inches (455 mm) minimum below the stationary water level. Advisory 1009.5.4 Transfer Steps....
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R406.3 Unobstructed Side Reach
approach to an element and the side reach is unobstructed, the high side reach shall be 1220 mm (4.0 ft) maximum and the low side reach shall be 380 mm (1.25 ft) minimum above the finish surface...
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Built-up Curb Ramps [4.7.6]
(The surface of access aisles cannot slope more than 2% in any direction)....
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4.1.7(3)(e)
., open books), should be no higher than 44 in (1120 mm) above the floor surface....
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Wheelchair Work Measurement Method
Wheelchair work per meter values for straight and turning were determined for all test course surfaces except sand, under dry conditions using the Wheelchair Work Measurement Method in accordance...
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Fixed tactile maps
Placement on a horizontal or near horizontal surface provides the map reader with a real world orientation....
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6.9 Tread Obstacles
Where the surface is paved or is elevated above the natural ground, obstacles shall not exceed 1/2 inch (13 mm) in height measured vertically to the highest point....
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Original research for ANSI A117.1 (1957 - 1961)
Buildings and Facilities Accessible to, and Usable by, the Physically Handicapped, ramps were assessed for flatness based on measuring 18 - inch increments on both edges of the ramped surface...
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11B-704.5 TTY shelf
The telephone handset shall be capable of being placed flush on the surface of the shelf....
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Expert opinion on current literature
There is a consensus among studies that transferring to a higher surface implies greater exertion of the upper limb (3-6) . ...
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Taking Measurements
Taking Measurements Sloped Surfaces One way to measure slope is to use a 24-inch level with leveling bubble and a tape measure....
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What was measured and why?
Often, an unstable surface, for example, may be perceived as very difficult because of the unstable footing, even though the individual does not have to exert him/herself....
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GRADE (Adjacent Ground Elevation)
[DSA-AC & HCD 1-AC] The lowest point of elevation of the finished surface of the ground, paving or sidewalk within the area between the building and the property line or, when the property...
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1011.2 Clear Ground Space
Where individual outdoor constructed features are altered and the ground surface is not altered, the clear ground space shall not be required to comply with 1011.2.2 and 1011.2.3. 2. ...
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1005.2.1 Height
At least 25 percent of the railings, guards, or handrails shall be 34 inches (865 mm) maximum above the ground or deck surface....
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Start of Play Areas
It must have a slope no steeper than 1:48 so that people using wheelchairs or mobility devices do not have to hit the ball while positioned on a sloped surface....
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Accessible Routes
The accessible route must comply with ADAAG provisions for location, width (minimum of 36 inches), passing space, head room, surface, slope (maximum of 1:12 or 8.33%), changes in level,...
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11B-1009.5.2 Transfer space
A transfer space of 60 inches (1524 mm) minimum by 60 inches (1524 mm) minimum with a slope not steeper than 1:48 shall be provided at the base of the transfer platform surface and shall...
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10.3.1(13)
(13) Where it is necessary to cross tracks to reach boarding platforms, the route surface shall be level and flush with the rail top at the outer edge and between rails, except for a maximum...
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1132A.4, Item 3
Secondary exterior doors onto decks, patios, or balcony surfaces constructed of impervious materials (e.g., concrete, brick, flagstone) may have a maximum change in height from the interior...
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Alterations and Additions
Normal maintenance, such as pothole repair, surface patching, or repainting in place existing striping for a few spaces, is not considered an alteration except where it affects a facility...
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§ 37.91(e)
Appropriate auxiliary aids and services include providing a hard surface on which to eat....