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The Law and Detectable Warning Surfaces


                                                       FEDERAL


    The Americans with Disabilities Act (ADA) (42 U.S.C. 12101 et seq.) is a federal civil rights law that prohibits
    discrimination against individuals with disabilities. The regulations issued by the Department of Justice include
    accessibility standards for the design, construction, and alteration of facilities. One of those requirements
    requires installation of detectable warning surfaces as described in these sections of the ADA Accessibility
    Guidelines (ADAAG) for Public Rights-Of-Way (July 26, 2011). To view the entire proposed guidelines document go
    to www.access-board.gov

    R305.1.1 Dome Size.
    The truncated domes shall have a base diameter of 23 mm (0.9 in) minimum and 36 mm (1.4 in) maximum, a top
    diameter of 50 percent of the base diameter minimum and 65 percent of the base diameter maximum, and a height
    of 5 mm (0.2 in).

    R305.1.2 Dome Spacing.

    The truncated domes shall have a center-to-center spacing of 41 mm (1.6 in) minimum and 61 mm (2.4 in) maximum,
    and a base-to-base spacing of 17 mm (0.65 in) minimum, measured between the most adjacent domes.

    R305.1.3 Contrast.
    Detectable warning surfaces shall contrast visually with adjacent gutter, street or highway, or pedestrian access route
    surface, either light-on-dark or dark-on-light.

    R305.1.4 Size.
    Detectable warning surfaces shall extend 610 mm (2.0 ft) minimum in the direction of pedestrian travel. At curb
    ramps and blended transitions, detectable warning surfaces shall extend the full width of the ramp run (excluding any
    flared sides), blended transition, or turning space. At pedestrian at-grade rail crossings not located within a street or
    highway, detectable warnings shall extend the full width of the crossing. At boarding platforms for buses and rail
    vehicles, detectable warning surfaces shall extend the full length of the public use areas of the platform. At boarding
    and alighting areas at sidewalk or street level transit stops for rail vehicles, detectable warning surfaces shall extend
    the full length of the transit stop.

    R305.2 Placement.
    The placement of detectable warning surfaces shall comply with R305.2.
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