A fire escape is a special kind of emergency exit, usually mounted to the outside of a building. It provides a method of escape in the event of a fire or other emergency that makes the stairwells inside a building inaccessible. Fire escapes are most often found on multiple-story residential buildings, such as apartment buildings. At one time, they were a very important aspect of fire safety for all new construction in urban areas; more recently, however, they have fallen out of common use. This is due to the improved building codes incorporating fire detectors, technologically advanced fire fighting equipment, which includes better communications and the reach of fire fighting ladder trucks, and more importantly fire sprinklers.