2010 ADA Standards for Accessible Design Pocket Guide
503 Passenger Loading Zones
Passenger loading zones shall provide a vehicular pull-up space 96 inches (2440 mm) wide minimum and 20 feet (6100 mm) long minimum. [S.H. 4.6.6]
Passenger loading zones shall provide access aisles complying with 503 adjacent to the vehicle pull-up space. Access aisles shall adjoin an accessible route and shall not overlap the vehicular way. [S.H. 4.6.6]
Access aisles serving vehicle pull-up spaces shall be 60 inches (1525 mm) wide minimum.
Access aisles shall extend the full length of the vehicle pull-up spaces they serve.
Access aisles shall be marked so as to discourage parking in them.
Vehicle pull-up spaces and access aisles serving them shall comply with 302. Access aisles shall be at the same level as the vehicle pull-up space they serve. Changes in level are not permitted. [S.H. 4.6.6]
EXCEPTION: Slopes not steeper than 1:48 shall be permitted.
Vehicle pull-up spaces, access aisles serving them, and a vehicular route from an entrance to the passenger loading zone, and from the passenger loading zone to a vehicular exit shall provide a vertical clearance of 114 inches (2895 mm) minimum.