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Page last updated at 08:12 GMT, Sunday, 29 June 2008 09:12 UK

3-D speed bump unveiled

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Drivers in Philadelphia have been confused by 'fake' speed bumps that have started to appear around the city.

The bumps have been created by high-tech plastic devices which create a 3-D image that looks like a bump in the road and gives the illusion that something is sticking up, causing drivers to slow down.

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