The main concept you should keep in mind is to take an account of the body movement while building a staircase. The whole movement of the steepness and pitch. Exterior and interior stairs have lot’s indifference. You have to keep tracks of the treads and risers. That will get tricky at times. The width and the height should be the same or else it’s dangerous. The exit is the path or passageway leading to an exit should be as direct as possible, be unobstructed by projections such as open doors, and be well lit. The red EXIT sign is a universal sign for an emergency path out.