Flub back and forth with Transportation Secretary and the Whitehouse - it's been pulled as something they are pursuing. Talk about a nightmare situation - tracking everyone via GPS by the federal gov't?
The problem long term (20-50-75 years) is the dwindling revenues from gas tax as petro is phased out because of decreasing supply and changes to alternative fuels. The Federal Gov't tracking via GPS on gas cars is really really stupid.
The short term answer is there are hundreds of ways the Federal Gov't can find ways to tax, they will come up with other hair brained ideas too.