Which statement identifies the main contributing factor to runway incursions?

• A. Mechanical issues on aircraft
• B. Weather variability
• C. Human error
• D. Communication gaps

Answer: (C)

Human factors and situational awareness are the main issue here. Runway incursions happen most often when people—pilots, ground crew, or air traffic controllers—misread instructions, misunderstand a clearance, or lose track of where they are on the airfield. That human element leads to entering or occupying a runway when it’s active, which is the dangerous moment these events target.

Mechanical problems can cause disruptions, and weather or visibility can complicate taxiing, but they are not the primary driver of most incursions. Communication gaps can contribute to miscoordination, yet they typically reflect how people interpret or respond to information rather than being the root cause themselves. The goal of safety practice is to reduce these errors through clear, standardized phraseology, timely readbacks, disciplined cockpit and ground operations, and strong awareness of runway locations and statuses. Emphasizing how people interpret and act on clearances helps explain why human error is the leading factor and guides effective prevention.