Patent attributes
A tactile warning surface structure having underfoot detectability is formed in place by a method wherein the shank portions of a plurality pins are inserted into and bonded to a plurality of holes formed in an upper surface of a concrete slab of a walkway. The holes are located within a defined area of the upper surface of the concrete slab and are spaced from each other in a predetermined pattern so that, when the shank portions of the pins are inserted into and bonded to the holes in the concrete slab with the upper end head portions of the pins projecting upward beyond the upper surface of the concrete slab at least a minimum distance, the pins in the defined area of the upper surface of the concrete slab form a tactile warning surface having underfoot detectability.
