Slides can be single or dual lane, depending on the width of the exit they are fitted to and in testing must show a nominal exit rate of 70 people per minute per lane. A dual lane slide is one that is capable of carrying two parallel lines of evacuees and is typically used at the main doors on Widebody aircraft. Slides and slide/rafts can be detached from the aircraft. This may, for example, involve lifting up the flap on the girt bar, and pulling the detach handle. These procedures are usually placarded red on the slide, "For Ditching Use Only". Once the slide is separated, the slide remains attached to the aircraft by a mooring line. This line will break if the airframe submerges, or can be disconnected with a pre-supplied knife or disconnect handle.