US Patent 10497228 Perforated tactile warning device

Described herein is a perforated tactile warning device comprising a tactile panel and a porous concrete slab. The tactile panel includes perforations to allow water to pass through the tactile panel and the tactile panel is secured to the porous concrete slab such that a space exists between the tactile panel and the porous concrete slab. Further, the porous concrete slab may include channels to collect water and direct water within the porous concrete slab. Further still, where the concrete slab includes channels, the concrete slab may be nonporous and may utilize drainage holes to permit water to pass through an otherwise nonporous concrete substrate.