Ever since the year 1990 when the ADA (Americans with Disabilities Act) was signed into law and the DOJ (Department of Justice) became the lead agency that oversees the ADA, several design standards have been implemented for complying with the ADA.
The ADA Accessibility Guidelines for Buildings and Facilities (ADAAG) requires that both municipalities and states install truncated dome pavers on all new curb ramps and any projects involving alterations to existing ramps. The lack of curb ramps and non-compliance with design standards constitute the greatest number of ADA complaints in the pedestrian environment, and there seems to be a continuous misconception that detectable warnings are not a requirement, but they are.
The laws and guidelines are the same for all 50 states per ADA, however the use of material differs. As an example, a municipality in New York may require brick domes to match the surrounding façade, but the state may require a liquid applied application due to the weather or other factors.
Before deciding on a material or location of the domes, consult with your states’ local ADA code. Some links are below for various states.