Detectable Warning Systems Overview

Detectable warning systems, in adherence with the Americans with Disabilities Act (ADA), are to ensure a safe community for all residents, regardless of handicap, by warning of hazards that may lie ahead.

A detectable warning system is a tactile tile featuring a series of truncated domes measuring 0.9 inches in diameter, 0.2 inches in height, and 2.35 inches centre-to-centre spacing. They must consist of exposed aggregate concrete and cushioned surfaces that are made of rubber or plastic. They may also be raised strips or grooves, though domes have recently become the industry standard and, according to the ADA act, grooves can only be used indoors. In the past, detectable warning systems were made of metal, but have since been modified to a form of engineered plastic, to avoid confusion with grating and other street-applicable terrain.

The ADA Accessibility Guidelines states detectable warning systems must be used on curbs, ramps, dangerous vehicle areas, and transit platforms. They are also found near pedestrian crossings, stairways, escalators, and anywhere else that may lead to pedestrian injury. Most importantly, the detectable warning system must contrast with the surrounding surfaces and stand out from the surrounding environment. Bright colors are an effective way to differentiate a detectable warning system from paved areas.

All public domains are to install detectable warning systems for the wellness and safety of residents who are handicapped or ill, especially those who are blind or visually impaired.

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