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Of course but why add to that if you don't have to?
I think it would be political suicide to ask everyone to add GPS tracking to their car not to mention the logistics of retrofitting that.It would be super easy to report and charge mileage based on an existing process like MOTs.
You could also just setup local reporting centres. Just drive in, get someone to read the mileage, sign a digital form and fuck off. 2 mins tops.
Something like that. I would oppose black box tracking as they gov do enough data collecting as it is - don't want to add location of every car on the road.
France is pretty straight forward for motorways; they have a little box that sits in the car that automatically opens a barrier and charges your account.
MOT mileage would also work assuming it was audited occasionally.