ADA's (Americans with Disabilities Act) signage rules: significant, strict, specific.
Knowles
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D001107:Architectural Accessibility / Q000331:legislation & jurisprudence*; D002961:Civil Rights / Q000331:legislation & jurisprudence; D006233:Persons with Disabilities / Q000331:legislation & jurisprudence*; D008123:Location Directories and Signs / Q000592:standards*; D010934:Planning Techniques; D014481:United States