Would you really need two batteries? Can batteries be charges as they are depleted?
I reckon the best solution is battery powered cars with an electric pickup for longer journey with either a rail buried in the road, like Scalextric cars, or poles connecting to overhead cables like trams or bumper cars. Road charging could be used to pay for the electricity used.
Of course it would cost billions to implement and overhead or buried copper would be a thief's delight.
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