Video: Traffic fence in China collapses like row of dominoes The almost mile-long fence on Shuanglong Bridge tumbled over in just 30 seconds on Tuesday. It was the second time in ten days that it had collapsed, according to the deputy head of Jinhua traffic police, Shao Zhichang. "The main reason is the strong wind as the dividing fences are not fixed to the ground," Mr Shao said. Police had to lift the fence back up section by section. The municipal administration said it plans to install a new barrier with a wind-resistant design by the end of July.