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Put slot car tracks on the freeways (where pedestrians are banned), and then small batteries can take care of the shorter trips off the freeways. Paying for use would be simple with new smart meters transmitting usage to the power company. synchronous motors with AC power could control speed and the tracks control direction. Simply get on the highway and connect and go to sleep with a GPS alarm to wake you when you need to disconnect and move to local roads at your destination.