Its a good idea, a hybrid/fuel efficient car puts the same stress on a road as a standard car, a larger car = more stress.
So basically there might be 5 bandings:
1: Motorbikes/ULV - 1x
2: LV - 1.2x
3: standard car 1.5x
4: SUV - 2x
5: Vehicles over 3Tonnes 3x
So a light vehicle like a motorbike pays just the charge, a regular car pays 1.5x as much as a motorbike etc...
It makes more sense, if you also keep the tax on the fuel then it encourages people to drive fuel efficient light cars (less environmental damage)... if people want to drive an SUV getting 1m/g then they can... but it costs them a lot more because their environmental impact is far greater than the person driving the fuel efficient car.
Remember that the gas tax was designed to tax fairly across all vehicles... the more you use the more you drive the more you pay. However as cars get more efficient and not lighter then you have to pay more...
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