You don’t need electricity with this simple but effective design. The weight of the car pushes the gate open. A cattle grid prevents animals from trying to escape the same way.
-via Laughing Squid
Very clever, but it could do with some dampers to calm it down a bit.
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It's like the minecraft pressure plates :D
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...in which we learn what a "cattle grid" is. Thanks John!
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Isn't that what the cattle grid already does? So what's the point of the gate?
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