logo
logo
Sign in

A Complete Guide about ADAAG Detectable Warnings

avatar
Tactile Solution
A Complete Guide about ADAAG Detectable Warnings

Various agencies forwarded many questions regarding the use of attention tactile indicators, specifically truncated domes, detectable warnings while constructing or altering curb ramps.

 

Truncated domes are the standard design requirement for detectable warnings for defining the boundary between the street and sidewalk by people with visually challenged.

 

The Department of Justice (DOJ) is the lead that directs the ADA act (1990). The United States Access Board develops the minimum design standards for meeting the terms according to the Americans with Disabilities Act (ADA). 

 

The Department of Transportation (DOT) is a designated agency responsible for implementing the standards and applying ADA regulations (Title II – State and Local Government Services). According to the Title II implementing regulations, the Federal Highway Administration (FHWA) is the enforcement authority at the helm of pedestrian discrimination issues.

 

In 1991, ADAAG asked for detectable warnings for hazardous vehicular ways, transit platform edges, photoluminescent exit signs, and curb ramps. A suspension was placed on needful detectable warnings at curb ramps and hazardous vehicular ways, but not for transit platform edges. The reason was to research the detectability performance.

 

The Department of Justice (DOJ) was suspended through July 26, 2001, which allowed a decade to conduct research. The research ensured that other designs used in truncated domes were not detectable in the roadway and sideway environment because of the similarities to other surface defects, patterns, and textures. 

 

The original ADA design standard for truncated domes was found in ADAAG (4.29.2). After the complete research, a new design recommendation was made for the dimension and placement of the curb ramps. Both Federal Highway Administration (FHWA) and the United States Access Board encourage the use of the new design over the original.


Ref: https://www.fhwa.dot.gov/environment/bicycle_pedestrian/resources/dwm.cfm

collect
0
avatar
Tactile Solution
guide
Zupyak is the world’s largest content marketing community, with over 400 000 members and 3 million articles. Explore and get your content discovered.
Read more