1991 ADA Standards for Accessible Design

4.2.4.1 Size and Approach.

The minimum clear floor or ground space required to accommodate a single, stationary wheelchair and occupant is 30 in by 48 in (760 mm by 1220 mm) (see Fig. 4(a)). The minimum clear floor or ground space for wheelchairs may be positioned for forward or parallel approach to an object (see Fig. 4(b) and (c)). Clear floor or ground space for wheelchairs may be part of the knee space required under some objects.

Fig. 4 Minimum Clear Floor Space for Wheelchairs

Fig. 4 Minimum Clear Floor Space for Wheelchairs

Fig. 4 Minimum Clear Floor Space for Wheelchairs