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omgwtfbbq said:
I wonder if it would be possible to charge the cars from electric fields generated at, say, traffic lights. That way electric cars could practically run forever without ever having to plug it in. Of course, you could

Of course while the science is there the question remains of who will pay the bill =)

Sure, it's possible... if you don't have a problem with wasting 99% of the energy used to power such a device, and don't have a problem with people dying due to the humongous magnetic field a current like that would generate.