Which of the following is NOT a type of runway incursion?

The correct answer is that weather deviations are not categorized as a type of runway incursion. Runway incursions specifically refer to incidents where unauthorized vehicles, personnel, or aircraft enter a runway, leading to potential conflicts with aircraft that are taking off or landing.

Operational errors occur when air traffic control fails to provide proper separation between aircraft or incorrectly clears an aircraft onto a runway.

Pilot deviations refer to actions taken by pilots that lead them to inadvertently enter a runway without clearance, such as miscommunications or misinterpretations of instructions.

Vehicle/pedestrian deviations are when vehicles or people enter the runway area without permission, which also constitutes a safety risk.

Weather deviations, on the other hand, pertain to situations where weather conditions affect operations but do not fit the definition of a runway incursion since they do not involve unauthorized entries onto the runway. Thus, this makes it the correct answer.