"Disrupt emergency exits to boost evacuation rates"

Counter-intuitive, yes?

Need to evacuate people quickly through a narrow opening? Put something in their way.

Physicists timed a crowd of 50 women as they exited as fast as possible through a door, and then repeated the experiment with a 20-centimetre-wide pillar placed 65 centimetres in front of the exit to the left-hand side.

The obstacle improved the exit rate by an extra seven people per minute – from 2.8 people to 2.92 people per second.