There's maintenence in local roads too. And maintence is broadly relative to the damage caused, which is relative to the 4th power of axel weight. A 30 ton truc

There's maintenence in local roads too. And maintence is broadly relative to the damage caused, which is relative to the 4th power of axel weight. A 30 ton truck will cause thousands of times the damage of a 2 ton car, but doesn't pay thousands of times the price.