Answer
People in the queue have less room to move away from a falling aircraft, so one failure can expose several people at once.
Explanation
Density and ability to disperse matter, not only headcount.
Drone exam · Ground-risk mitigation
Drone exam · Ground-risk mitigation
People in the queue have less room to move away from a falling aircraft, so one failure can expose several people at once.
Density and ability to disperse matter, not only headcount.