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(6) Platform surface. The platform surface shall be free of any protrusions of 1/4 inch (6.5 mm) high and shall be slip resistant. The platform shall have a minimum clear width of 28 1/2 inches (725 mm) at the platform, a minimum clear width of 30 inches (760 mm) measured from 2 inches (50 mm) above the platform surface to 30 inches (760 mm) above the platform, and a minimum clear length of 48 inches (1220 mm) measured from 2 inches (50 mm) above the surface of the platform to 30 inches (760 mm) above the surface of the platform. (See Figure 1 to this part.)  

Diagram showing wheelchair or mobility aid envelope

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