Putting a column in front of an exit is an elegant way to help prevent clogging. In every case, communication between organizers and with the crowd is critical. Officials need to constantly monitor the crowd’s movement and quickly relieve pressure points. The New Year’s Eve celebration in Times Square in New York City is a model event, Still says. Police funnel over half a million revelers into separate viewing pens. Once people leave a pen, they cannot come back. That rule reduces the amount of traffic flow. At police headquarters, meanwhile, about seventy officers monitor live feeds of the
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