ABA Accessibility Standard for GSA Facilities Pocket Guide
502.4 Floor or Ground Surfaces.
Parking spaces and access aisles serving them shall comply with 302. Access aisles shall be at the same level as the parking spaces they serve. Changes in level are not permitted. [ECTCR UFAS 4.6.3]
EXCEPTION: Slopes not steeper than 1:48 shall be permitted.
Advisory 502.4 Floor or Ground Surfaces. Access aisles are required to be nearly level in all directions to provide a surface for wheelchair transfer to and from vehicles. The exception allows sufficient slope for drainage. Built-up curb ramps are not permitted to project into access aisles and parking spaces because they would create slopes greater than 1:48.
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