Wear and tear scales with the fourth power of the weight on an axle. So this does provide a strong incentive for lighter vehicles, it also becomes a drag on mov

Wear and tear scales with the fourth power of the weight on an axle. So this does provide a strong incentive for lighter vehicles, it also becomes a drag on moving things in the economy which is not so desirable, and essentially becomes a kind of consumption tax, which is perhaps a bit more progressive than fuel duty though I’m not sure.