Primary Usage is not use as much as I think it should be. When i did my cadet teaching in high school , they way that the classroom was set up there was no way that a student with a wheel chair could fit through the door or even be able to move around the class room comforterably. As a teacher you need to prepair your sefl to accomadate students with disabilities, if the school its self will not a teacher should always make sure that their is some way he or she can have that students in their classroom