Sidewalk curb ramps incorporate detectable warning surfaces consisting of truncated domes arranged in an in-line pattern with the direction of travel. Individual domes measure zero point nine inches in spacing and zero point two inches in height, constructed from fiberglass reinforced polymer with a twenty percent minimum contrasting shade from the surrounding concrete sidewalk. Ramps span the full width of the curb ramp by two feet deep with a minimum four-foot clearance, utilizing one-to-fifteen flares when clearance is restricted. Curb walls measure six inches wide by twelve inches deep at the back of ramps where applicable.
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