A runway excursion is a runway safety incident in which an aircraft makes an inappropriate exit from the runway.
There are several types of runway excursions: [1]
When an aircraft exits the end of the runway, this is referred to as runway overrun (or informally, runway overshoot). Runway excursions can happen because of pilot error, poor weather, or a fault with the aircraft. Runway excursions may occur both during takeoff or landing.[2]
According to the Flight Safety Foundation, as of 2008, runway excursions were the most frequent type of landing accident, slightly ahead of runway incursion.[3] For runway accidents recorded between 1995 and 2007, 96% of runway accidents and 80% of accidents with fatalities involved runway excursions.[3]