>> Maybe you don't need infrastructure all over every road.
>>
>> Start car. Car sends current mileage to somewhere. End drive. Car sends current mileage to
>> somewhere. Generate bill. Pay online by midnight tomorrow.
If you just charge a nominal few pence per mile that might work.
In practice though charging would surely need to be graduated so as to reflect demand as to both timing and route.
Thirty seven miles over the A859 from Stornoway to Tarbert is one thing. The same distance around, or inside of, the M25 has a vastly higher 'market value'.
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