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The bridge plate extends from the vehicle to the platform, which must be raised to close to the level of the floor of the vehicle so that the wheelchair need not travel over an excessively steep ramp (in the United States, the Americans with Disabilities Act specifies that the slope must be no more than 1 inch of rise for every 12 inches of ...
Accessible curb cuts transition from the low side of a curb to the high side (usually 15 cm or 5.9 in change in level). Accessible curb ramps are a minimum of 1 metre (3.28 ft) wide. They are sloped no greater than 1:12 (8.33%), which means that for every 12 cm (4.7 in) of horizontal distance, they rise no more than one centimetre (3 ⁄ 8 in
In the US, the Americans with Disabilities Act (ADA) requires a slope of no more than 1:12 for wheelchairs and scooters for business and public use, which works out to 1 foot (305 mm) of ramp for each one inch (25.4 mm) of rise. For example, a 20-inch (510 mm) rise requires a minimum of 20 feet (6.10 m) in length of ramp.
When designing a curbed roadway, engineers specify the "reveal" or "lip". The reveal is the height of the section that is visible (revealed) above the road surface. Typical reveals are in the 4 to 8 inches (100 to 200 mm) range. Curbs at handicapped curb cuts (or "kerb ramps", for example in Australia) should have no reveal. [15]
The size has to be comfortable for grasping and is typically between 1.25 and 2.675 inches (31.8 and 67.9 mm). Maximum space between the balusters of the handrail. This is typically 4 inches (102 mm). Openings (if they exist) between the bottom rail and treads are typically no bigger than 6 inches (152 mm). Headroom: At least 83 inches (211 cm).
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