Take the subway in Boston. You'd be baffled at the ingress/egress difficulties encountered. People block the doors. Passengers boarding don't wait for passengers departing to exit the cars before they attempt to force their way in. People are reluctant to take a seat between other people (especially women when the seat is between two men), reducing standing space. Standing passengers do not move towards the ends or center of the cars to allow more passengers to board.

This is usually accompanied by at least 30 seconds of announcements from the on-board spotter over the train's intercom system. Per stop. I've seen this take as long as 90 seconds.