This 1994 image depicted a scenario common to wheelchair users, involving the difficulties in maneuverability of the chair's wheels encountered when traveling through various terrains. In this particular instance, the ground surface was composed of loose gravel, which reduced traction, and the wheel's ability to make forward progress. Being that this was a motorized wheelchair, it was much heavier than the non-motorized version, and was therefore, not only impossible for its user to extricate himself from the situation, but would have been most difficult, even for a strong assistant to accomplishing as well. When constructing pathways, all user groups must be taken into account, not only for those walking, but all types of mobility-challenged individuals, who'd be using wheelchairs, canes, and crutches, a philosophy implemented by the Center for Universal Design, (CUD).
CDC/ Richard Duncan, MRP, Sr. Proj. Mngr, North Carolina State University, The Center for Universal Design
November 3, 2012