1991 ADA Standards for Accessible Design

A4.2.4 Clear Floor or Ground Space for Wheelchairs.

The wheelchair and user shown in Fig. A3 represent typical dimensions for a large adult male. The space requirements in this guideline are based upon maneuvering clearances that will accommodate most wheelchairs. Fig. A3 provides a uniform reference for design not covered by this guideline.

Fig. A3 Dimensions of Adult-Sized Wheelchairs

Fig. A3 (a)