"Our paper gives an explicit guideline and formula of how to estimate this critical crowd size, which can be used to limit the carrying capacity of an existing bridge and to help designers build better bridges. There is an important threshold effect,” Dr Igor Belykh, professor in the Department of Mathematics and Statistics at Georgia State said. This is true, but only for crowd sizes above this critical size. "The current view is the more pedestrians we add to the bridge, the wilder the oscillations will be. In a recently published paper, researchers from Georgia State University challenged the widespread view that increasing the crowd size will gradually increase the bridge wobble. The Singapore Airport's Changi Mezzanine Bridge is another example of an unstable pedestrian bridge. In 2014, the Squibb Park Bridge in Brooklyn, New York, bounced from side to side as pedestrians crossed the bridge and didn't reopen until early 2017. In 2003, the Clifton Suspension Bridge in the UK, originally designed as a highway bridge, had to be closed when it started wobbling sideways abruptly as a crowd crossed it during the International Balloon Fiesta. In 2000, the London Millennium Bridge began to sway on its opening day as thousands of pedestrians crossed it and the $32 million bridge had to be closed. In an effort to combat this, a new model has been developed to predict the effect of large crowds of people on bridges. ![]() Many pedestrian bridges around the world have experienced dramatic vibrations and dangerous wobbling when crowds of pedestrians have tried to cross them, with some bridges even collapsing.
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