When large crowds assemble, is there a way to keep them safe?
As predicted, none of this helped Wertheimer’s career as a crowd-management consultant; his pugnacious personality didn’t help, either. “The industry didn’t want anything to do with me,” Wertheimer told me. In Chicago, where Wertheimer was born, on the South Side, he ran afoul of a concert promoter, Jam Productions, for helping to publicize safety issues at rock concerts.
But Helbing also observed that at certain critical densities, such as occur in a crowd crush, all forms of collective behavior vanish. Shock waves are the result not of collective behavior but of the failure of it. Individuals at the back of a crowd, unable to tell what is happening up ahead, push forward, not realizing that they are injuring the people in the front.
One particularly damning bit of evidence was a video that students from the New York Institute of Technology had chanced to make of a management meeting two days before the Blitz Day event. Rice can be heard raising the matter of the 2007 melee with Steve Sooknanan, the Wal-Mart manager, and saying that people had to be kept away from the doors this year. He says, “Last year was crazy, a lot of people fell, little babies out there and it was cold, I just don’t want that this year.
Wertheimer was allowed to continue, and during two days of testimony detailed many crowd measures that Wal-Mart could have taken. He was particularly effective in showing why the construction barriers wouldn’t control the crowd: they were too low to keep people out, and they were flared at the bottom, so that people who got pushed up against the sides fell in.
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