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Note: This document or portion of document references a state or local code that is stricter than the 2010 ADA Standards requires.

11B-705.1.1.3.2.

Detectable warning surfaces shall provide a 70 percent minimum visual contrast with adjacent walking surfaces. Contrast in percent shall be determined by:

Contrast percent = [(B1-B2)/B1] x 100 percent where

B1 = light reflectance value (LRV) of the lighter area and

B2 = light reflectance value (LRV) of the darker area.

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