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straight edge 1/4" high max. Carpet To Tile Transition, Belgian Block, Curb Ramp, Travel Directions, Ada Compliance, Egress, Federal Agencies, Flooring Materials, Chapter 3
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The U.S. Access Board is a federal agency that promotes equality for people with disabilities through leadership in accessible design and the development of accessibility guidelines and standards for the built environment, transportation, communication, medical diagnostic equipment, and information technology.