If you were wondering how the government would keep track of miles traveled, some of the infustructure has already been installed, if you look around you will see EZ pass sensors even in the direction of travel with no toll on roads and bridges with tolls in only one direction, you will also note high definition cameras on the highways and bridges, then there are the satalite linked on board systems in newer cars, even if you don't subscribe to the service they still share data