Architects and city planners try to accommodate the symptoms of panic, such as herd behavior, during design and planning, often using simulations to determine the best way to lead people to a safe exit and prevent congestion (stampedes). The most effective methods are often nonintuitive. A tall column, approximately 1 ft (300 mm) in diameter, placed in front of the door exit at a precisely calculated distance, may speed up the evacuation of a large room by up to 30%, as the obstacle divides the congestion well ahead of the choke point.
Source: Wikipedia
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