Big Brother in Oregon?

So I recently read that Oregon is starting to lose revenue on gas taxes because people are buying smaller, more gas efficient cars. So to make that money back they are seriously considering taxing the amount of miles that are driven instead of the amount of gallons purchased. Basically you would put a little gps unit in your car that would track where, when, and how far you drove and then tax you on instate and peak hour diving. Track my driving? Ok I don't live in the Oregon and have no plans to move there in the future, but if it works in one state others might adopt it, and that worries me. I don't want anyone tracking my driving. True I don't go anywhere interesting but thats not the point. The point is that this falls under personal privacy, as a private citizens I have a right to go where ever I want. And of course they say that the information from the gps wouldn't be used for anything else and would be erased every time you go to the gas station and pay your taxes. But you know are government would start using those records to follow people around, of course only suspicious people, but what exactly is the definition of a suspicious person? What right do they have to ask me where I go?

 

And then what if they decide to track how fast you were going? Automatically send you a ticket when you go over the speed limit? And then a little camera in the car to make sure that you are doing nothing illegal?