X02.5.7.3 Specifications . A few committee members did not fully support this recommendation, feeling there might be a significant adverse impact on safety and ease of travel for wheelchair users. It will also enable some persons having mobility impairments to make a smoother transition between the street and the curb ramp. Dome size and spacing . Figure X02.5 N Dome Section Section of dome from a detectable warning.
Drawing shows height, top and bottom dimensions.
Figure X02.5 O Dome Spacing Plan and section views of detectable warning domes and their relative spacing on the x and y axis. The size and spacing of the domes affect detectability by pedestrians who are blind. It ensures that the dome spacing is the maximum currently known to be consistent with high detectability. As currently implemented by most US manufacturers, it is the bottom diameter that measures 0.9 inch, and the top diameter varies widely. A few members of the committee felt that there needed to be more flexibility in the size and shape of the domes.