Use Clearance for Wheelchairs: figures 1.2(a) through 1.2(d) show the 30 by 48 inch wheelchair footprints for side and forward approach to elements. The individual figures are available by selecting the links at the bottom of this page.
1.2a Min clear floor space or ground space
1.2b Knee Clearance Overlap Front Approach
1.2c Side Approach Maximum Side Reach
1.2d Max Height and Depth of Obstruction