gramarye said:
I think the best system would be a weight-mile VMT system, but a straight VMT system or a modified system based on weight classes, wheels, axles, etc. would work as well.
I agree with the privacy concerns about mandatory GPS in every vehicle, but I also think that some people would voluntarily allow a GPS in their vehicle both as an alternative to going to the DMV and also as a possible means of recovering a vehicle in the event of theft (assuming that it wasn't too effortless to disable).
Avoidance would be a serious problem unless you found a way to use the existing withholding mechanisms to withhold estimated VMT taxes from paychecks, based on estimated tax.
The other thorny issue is jurisdiction. Does mere registration in the state give Ohio authority to tax miles traveled in other states--wearing and tearing on other states' infrastructure? I honestly don't know.
Black boxes exist in most cars driven today (not necessarily black in the sense of crash proof), and were just legislated, even if people don't realize it, so adding GPS capability might be an element of that, though not necessarily.
Now, as far as driving miles in other States, there's a technological solution to that. You just record the incoming and outgoing of cars. Same principle by which toll roads record automated toll passage. There are, after all, limited roadway entry/exit points.
Avoidance is probably easier to deter than people think. Computers control nearly all aspects of new vehicle execution, so "killing" the ability to start a vehicle because you haven't paid you VMT tax isn't really a stretch. Or, next time you pull into Jiffy Lube, they tack on a $100 unpaid tax charge to your oil change bill. You could try avoidance through car purchases that don't have electronic brains, but the market for those is shrinking all of the time.