The wheelchair is used as a standard of accessibility, because wherever a wheelchair can go, so can a person using a walker, a cane, or crutches. For the convenience of the physically handicapped, washroom accessories should be mounted so that operating areas such as coin slots, push buttons, openings for towels, cups, and waste are no more than 40" above the floor. For the safety of the blind, objects below 6' 6" which protrude more than 4" must continue to the floor or to within 8" of the floor so that they may be detected by a person using a can or a seeing eye dog.