In what situation is a collision likely to occur in runway incursion category A?

A collision is likely to occur in runway incursion category A when there is significant potential for collision. This category is characterized by situations in which an incursion has occurred that poses an immediate and serious risk of collision between aircraft or between an aircraft and a vehicle on the runway.

In this context, it is essential to recognize that category A incidents involve serious breaches of runway safety protocols, often leading to critical situations where immediate corrective action may be required to prevent an accident. The involvement of significant potential for a collision indicates a high level of risk, necessitating urgent responses from air traffic control or involved personnel to mitigate the dangerous circumstances.

Other options imply a lower risk scenario: little or no chance of collision suggests a safe distance, no separation issues indicates that aircraft or vehicles are suitably spaced apart, and ample separation available would mean that the risk of collision is minimal. In contrast, category A's focus on significant risk underscores the urgency of addressing these incursions to preserve safety in airport operations.