Detectable warning surface A tactile, dome-patterned ground surface tile embedded into concrete to alert visually impaired pedestrians that they are entering a hazardous roadway or platform edge.
Commonly known as truncated dome mats, these detectable warning surfaces feature raised, slip-resistant domes arranged in a distinct grid pattern. Usually molded in bright red or yellow polyurethane or cast iron, they must contrast visually with the surrounding concrete sidewalk. In NYC, the DOT mandates these tiles at the transition boundary of every curb ramp and public pedestrian crosswalk, helping visually impaired individuals identify the physical edge of the street safely.
Frequently Asked Questions About Detectable warning surface
What is a detectable warning surface?
A tactile panel of raised truncated domes set into the sidewalk to alert pedestrians with visual impairments that they are entering a roadway.
Where are they required?
At the bottom of curb ramps and at the transition between the pedestrian route and the street.
Why must they contrast visually?
So people with low vision can see the boundary as well as feel it underfoot.
What are they made of?
Commonly polyurethane, composite or cast iron panels, set into the concrete during construction.
Can they be painted over or patched?
No. Altering or covering the domes defeats their function and can fail inspection.