What is a runway incursion?

A runway incursion refers specifically to an unauthorized entry by a vehicle or person onto an active runway, which poses a significant safety risk. This can occur when someone who is not permitted accesses the runway, potentially interfering with the operations of arriving and departing aircraft.

Understanding the dynamics of a runway incursion is crucial for maintaining airport safety and preventing accidents. The definitions of the other choices clarify why they do not represent a runway incursion. For instance, an emergency landing by an aircraft pertains to situations involving aircraft needing to land unexpectedly, while an authorized entry onto a runway involves people or vehicles that have received proper clearance and permission. Additionally, a temporary obstacle on the runway describes physical objects that may affect aircraft, but does not encompass the concept of unauthorized access, which is at the core of defining a runway incursion.