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This is a device that produces energy by compressing a paddle inserted into a roadway. In a busy intersection cars would drive over the paddle pushing it downward thousands and thousands of times, each time they drive over it, which will spin a flywheel attached to a magnet within a wire coil. This electromagnetic induction, which is the creation of voltage across a conductor through a magnetic field of some sort, would supply energy to a battery which would store the power. I'm not sure if something of this sort has been invented or patented (I couldn't find any information on a self-powered road), but to take back some of the energy we invest in our awful automobiles could only do us good I think.
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