There are many goals being served here.
1) Revenue grabbing, with the people owning real cars being taxed twice compared to those driving the fancy golf-carts....there's never any mention of people with internal combustion engines getting a tax rebate for gas taxes paid, and won't be.
2) Now the government knows how much you drive. With your address on record, with your job location on record, they can figure out how much you drive to other places, too. This brackets you.
3) The DMV will track this. More jobs for useless people who vote Rodent. The fascist state can always use more hangers-on.
4) Incrementalism. "Gee, we're not capturing the miles accurately, we'll have to start putting GPS reporters in every new vehicle sold." Now they can track where you go, every minute, every day. Of course, it will be 24 hours after this idea is foisted before the police get total access to these "public records", right?
5) What's the next step after gaining the power to track where you go, 24-7? Of course...they get to tell you where you can't go. And to make that idea work most effectively, they're going to start putting remote kill-switches on the vehicles, too.
And, as someone said, it certainly wouldn't be too difficult to write a computer algorithm to track time and distance with posted road speed limits and start issuing citations for speeding...and illegal parking, too.
After all, you people swallowed that seat-belt nonsense without complaint. That only took twenty years to choke all the way up, right?