Table 6.8 – Passenger Loading Zones
Current Guidelines:  
4.1.2  Accessible Sites and Exterior Facilities:  New Construction.  An accessible site shall meet the following minimum requirements: . . .

(5) . . . (c)  If passenger loading zones are provided, then at least one passenger loading zone shall comply with 4.6.

4.6.6  Passenger Loading Zones.  Passenger loading zones shall provide an access aisle at least 60 in (1525 mm) wide and 20 ft (240 in) (6100 mm) long adjacent and parallel to the vehicle pull-up space (see Fig. 10).  If there are curbs between the access aisle and the vehicle pull-up space, then a curb ramp complying with 4.7 shall be provided.  Vehicle standing spaces and access aisles shall be level with surface slopes not exceeding 1:50 (2%) in all directions. 

Final Revised Guidelines:  
209.2.1 Passenger Loading Zones.  Passenger loading zones, except those required to comply with 209.2.2 and 209.2.3, shall provide at least one passenger loading zone complying with 503 in every continuous 100 linear feet (30 m) of loading zone space, or fraction thereof.

503.2  Vehicle Pull-Up Space.  Passenger loading zones shall provide a vehicular pull-up space 96 inches (2440 mm) wide minimum and 20 feet (6100 mm) long minimum.

503.3  Access Aisle.  Passenger loading zones shall provide access aisles complying with 503.3 adjacent to the vehicle pull-up space.  Access aisles shall adjoin an accessible route and shall not overlap the vehicular way.

503.3.1  Width.  Access aisles serving vehicle pull-up spaces shall be 60 inches (1525 mm) wide minimum.

503.3.2  Length.  Access aisles shall extend the full length of the vehicle pull-up spaces they serve.

503.3.3 Marking.  Access aisles shall be marked so as to discourage parking in them.

503.4  Floor and Ground Surfaces.  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.
Exception: Slopes not steeper than 1:48 shall be permitted.

Model Codes & Standards
IBC 2000:  Section 1106.6 has a similar requirement for passenger loading zones. 

IBC 2003:  Sections 1106.7.1 and 1106.7.2 have equivalent requirements for passenger loading zones.

ICC/ANSI A117.1-1998:  Sections 503.3 and 503.4 have equivalent requirements for vehicle pull-up spaces, access aisles, and floor and ground surfaces.