How is an alert area defined in terms of the responsibilities of pilots?

An alert area is designated to inform pilots of areas where there is a high volume of pilot training or unusual aerial activity. In such areas, both participating pilots engaged in activities (like training flights) and transiting pilots flying through the area share the responsibility for collision avoidance. This means that while pilots who are actively participating in the training or unusual activities must be vigilant about their surroundings, it is equally important for pilots who are simply passing through the area to remain aware of potential hazards.

The shared responsibility emphasizes the necessity for all pilots, regardless of their specific operational status, to maintain situational awareness and take precautions to prevent collisions. This dual responsibility is vital for ensuring safety within the alert area, making it clear that transiting pilots cannot disregard their obligation to be vigilant just because they are not actively training or conducting unique operations.