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The ADA standards are issued by the Department of Transportation (DOT) and apply to public trasnporation facilities covered by the ADA in new construction and alterations.  

dotIn adopting its 2006 ADA standards, the Department of Transportation (DOT) reinstated a requirement for detectable warnings on curb ramps and revised three other provisions concerning the location of accessible routes, bus boarding areas, and rail station platforms. These provisions replace those in the Board's guidelines, as indicated in a DOT notice and information provided in DOT's ADA regulations (49 CFR part 37, Appendix D):

Location of Accessible Routes (language reinstated on minimizing travel distances)

206.3 Location. Accessible routes shall coincide with, or be located in the same area as general circulation paths. Where circulation paths are interior, required accessible routes shall also be interior. Elements such as ramps, elevators, or other circulation devices, fare vending or other ticketing areas, and fare collection areas shall be placed to minimize the distance which wheelchair users and other persons who cannot negotiate steps may have to travel compared to the general public.

Detectable Warnings on Curb Ramps (requirement added for detectable warnings on curb ramps according to updated technical specifications)

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.

Bus Boarding and Alighting Areas (compliance with dimensions is required to the extent construction specifications are within a public entity's control)

810.2.2 Dimensions. Bus boarding and alighting areas shall provide a clear length of 96 inches (2440 mm), measured perpendicular to the curb or vehicle roadway edge, and a clear width of 60 inches (1525 mm), measured parallel to the vehicle roadway. Public entities shall ensure that the construction of bus boarding and alighting areas comply with 810.2.2, to the extent the construction specifications are within their control.

Rail Station Platforms (language from the original standards reinstated concerning platform and vehicle floor coordination)

810.5.3 Platform and Vehicle Floor Coordination. Station platforms shall be positioned to coordinate with vehicles in accordance with the applicable requirements of 36 CFR part 1192. Low-level platforms shall be 8 inches (205 mm) minimum above top of rail. In light rail, commuter rail, and intercity rail systems where it is not operationally or structurally feasible to meet the horizontal gap or vertical difference requirements of part 1192 or 49 CFR part 38, mini-high platforms, car-borne or platform-mounted lifts, ramps or bridge plates or similarly manually deployed devices, meeting the requirements of 49 CFR part 38, shall suffice.

EXCEPTION: Where vehicles are boarded from sidewalks or street- level, low-level platforms shall be permitted to be less than 8 inches (205 mm).