Got an "on-star" equipped vehicle then you already have gps tracking, carry a cell phone? yep it's in there also. Really george orwell wrote 1984 about big brother controlling all aspects of your life and while off by a few years it's becoming more of a fact than the fiction he wrote about.
Truckers have been yelling about double taxation for years in regards to toll roads, we pay an annual tax for road use, a fuel tax, and then have to pay a toll to drive on the road we were just taxed for? Trucks pay over 1/3 of the annual road tax and now the politicians feel that the average american motorist can be forced to pay the same.
What they will do is put a small receiver just like the I-pass/EZpass transmitter in every car, each time you fuel you will be charged a pre set fee for your car based on estimated mpg and the amount of fuel you buy. I think the test that i heard about it averaged 25 cents a gallon tax? So if you had a car that got 20 miles to the gallon you would have to drive 80 miles to pay 1 dollar in taxes?
The only way i would go along with this type of taxation is if it is locked up and can only be used for road repair/improvements and nothing else! The highway trust fund has been so abused for so long by so many politicians that it is useless and broke and beyond any help as it currently is being run/managed.