If you are old enough to remember slot car racing, this might look familiar: an electric car powered by the roadway itself, rather than carrying its power supply along.
Some electric trolleys, subways and trains operate this way, because the vehicle is on a track, and the circuit is completed through a contact overhead. Bumper cars operate similarly, as they are always in contact with a metal floor, which completes the circuit through a pole in the back that touches the ceiling. But road cars can't do this -- you'd need something more akin to a third rail system.
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