36 CFR Parts 1190 and 1191 ADA and ABA Accessibility Guidelines - Preamble (Discussion of Comments and Changes)
Section 406.5 specifies the location of curb ramps at marked crossings. In the final rule, requirements for the general location of curb ramps that were provided at [DOT ADA Standards] section 406.8 in the proposed rule have been integrated into this provision for simplicity. As reformatted, section 406.5 covers the location of curb ramps, including at marked crossings.
Access Board’s Note to Reader:
The Department of Transportation’s ADA standards require detectable warnings on curb ramps: 406.8 Detectable Warnings. A curb ramp shall have a detectable warning complying with 705. The detectable warning shall extend the full width of the curb ramp (exclusive of flared sides) and shall extend either the full depth of the curb ramp or 24 inches (610 mm) deep minimum measured from the back of the curb on the ramp surface.
Comment. Curb ramps must be located so that they do not project into vehicular traffic lanes or parking spaces and access aisles. Commenters noted that this requirement should be clarified to apply not only to the run of the curb ramp, but also to flared sides, where provided.
Response. Consistent with the intent of the requirement in section 406.5, the Board has clarified that the specified location applies to curb ramps "and the flared sides of curb ramps."
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