Changes in Level [4.5.2]
Vertical changes in level up to ¼ inch are permitted without treatment along accessible routes. Changes in level ¼ to ½ inch must be beveled with a slope no greater than 1:2. Changes in level greater than ½ inch where the slope is more than 5% must be treated as a curb ramp [4.7] or ramp [4.8].
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