Reminds me of the study I read about how placing a barrier in the form of a pole in front of an emergency exit drastically improved how many managed to get out

Reminds me of the study I read about how placing a barrier in the form of a pole in front of an emergency exit drastically improved how many managed to get out during an emergency (simulated in the study). By introducing a barrier people are forced to reduce congestion, which avoids people trying to exit the door at the same time clogging it up.