Large gates have always had a couple of disadvantages – they need room to swing back or slide across a driveway, and they can be tricky to install on a sloping site.
A Polish company has an ingenious solution to solve these problems. Instead of swinging or sliding, the gate simply disappears down into the ground, leaving a flat surface you can drive over. And it only takes five seconds.
from
http://www.stuff.co.nz/life-style/home-property/88298778/Retractable-fence-disappears-into-the-ground-in-just-five-seconds
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