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Guide to the ADA Standards

Detectable Warnings on Curb Ramps

Curb ramp with detectable warnings at the bottom that extend the full width of the run and are 24” min. deep measured from back of curb. Note: light-on-dark or dark-on-light contrast with adjacent walking surface (color not specified).

Dome spacing .65” measured between base of domes and 1.6” – 2.4” measured between dome center
Dome size .9” – 1.4” base diameter, 0.2” height, top 50% - 65% of the base diameter

Source: Guide to the ADA Standards by U.S. Access Board - published 02/2014

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