ADA Best Practices Tool Kit for State and Local Governments

6 [§ 4.7.7]

Detectable warnings are dome-shaped bumps that should cover the entire width and depth of the ramp run. Detectable warnings are designed to be felt underfoot or with a cane by people who are blind or have low vision, thereby alerting them of hazards– mainly, the transition from a pedestrian-only area to a roadway.

If the curb ramp you are surveying has detectable warnings but they do not cover the entire ramp run, explain how they are different in the “Comments” section at the bottom of the form. For curb ramps along public streets, the U.S. Department of Transportation (DOT) has deemed permissible a strip of detectable warnings that stretches across the width of the ramp run but covers only the two feet nearest the road. If the curb ramp you are surveying is located along a public street, you may circle "Y" if the detectable warnings comply with the DOT’s design.