But why limit your idea just to road use ? Why not apply your theories to all public services and those who use them ? For example, when people go to A&E they could be made to produce their P60 to see how much income tax they pay. Those who pay a lot would be given priority as those who pay the most should always get most in return. People with low-paid jobs would be made to wait whilst students, those on benefits, carers, pensioners and other non-income tax payers could be thrown out into the car park with a sticking plaster.
It's only fair.