Sidewalk curb ramps require detectable warning surfaces extending the full width of the ramp and two feet deep, set in a contrasting color with at least twenty percent different shade from the adjacent concrete sidewalk. Truncated domes are cast iron, measuring zero point two inches in height and zero point nine inches in diameter, spaced in an in-line pattern with two inch and two point three five inch grid spacing. Ramps feature four foot minimum clearances and one to fifty or one to fifteen flares, with specific curb wall dimensions of six inches wide by twelve inches deep typical at the back of ramps.
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