The blind stair handrail / communication

The blind is a special group, needed to be assisted in their measures in public places. Such as he braille on the elevator buttons, blind road on the street, the sound of traffic light. Sometimes, blind will get into trouble to up the stairs. They can't see the signs so that they do not know which floors they are in. The design of handrail on the stairs have been raised Braille digital design is to solve this problem.