“Ambulatory disability” means a disability because of which a person:
(1) Has a physical and permanent disability to such a degree that the person is unable to move from place to place without the aid of a wheelchair;
(2) Is not able to cross curbs because of paralysis or loss of function of the person’s legs;
(3) Is missing one or both legs; or
(4) Has a permanently impaired or unsteady gait that makes it impossible or impractical to walk as a means of transportation.