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Vibration free 'sleeping policemen' are under development in Holland in a bid to cut down the associated noise and potential damage to adjacent buildings. A recently completed £15,000 trial carried out in a factory compound featured a typical road hump mounted on 36 neoprene-damped antivibration mounts. The hump was also surrounded by a flexible noise-reducing perimeter skirt. Variables measured during the trials included vehicle speed and weight, humidity and temperature and forces ...

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