A Condensed History of Detectable Warnings

In 1991, the Americans with Disabilities Act Accessible Guidelines (ADAAG) passed a motion through the U.S. Department of Justice, which would require city governments to line their streets with detectable warning systems for the blind and visually impaired. This motion required dangerous roadways, transit platforms, and curb ramps to implement these detectable warning systems.

In 1991, the Americans with Disabilities Act Accessible Guidelines (ADAAG) passed a motion through the U.S. Department of Justice, which would require city governments to line their streets with detectable warning systems for the blind and visually impaired. This motion required dangerous roadways, transit platforms, and curb ramps to implement these detectable warning systems.

In 1991, the Americans with Disabilities Act Accessible Guidelines (ADAAG) passed a motion through the U.S. Department of Justice, which would require city governments to line their streets with detectable warning systems for the blind and visually impaired. This motion required dangerous roadways, transit platforms, and curb ramps to implement these detectable warning systems.

The detectable warning system must be 24 inches in size and pointed in the direction of travel. It must extend the full width of the curb ramp and be flush with the surface. The Federal Highway Administration must enforce the use of detectable warning systems, while state and local governments must apply the minimum design standards when constructing and altering pedestrian facilities.

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