Explain This Trolley

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Uploaded by on Jun 29, 2011

How does this trolley fail to work after travelling over a poxy faint red line.
What is underneath the paving for this to happen.
Thank You all

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  • beam sensor in the flower beds after the red line activates the magnetic brakes in the wheels if you carry the trolly above you head past the red line onto the car park it will still work

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