The purpose of the proposed rule changes is a clarification of the medical conditions which qualify a person for certification as mobility-impaired. The current qualification of “permanently required to use assisting aids to walk” has been interpreted by certifying physicians in a manner inconsistent with the original intent of the mobility-impaired program. Single-leg amputees seeking certification must have an amputation above the knee to qualify for certification. The effect of the proposed rule changes will remove the subjective medical qualifications from future mobility-impaired certification applications.