> the heaviest users (‘heavy’ both figuratively and literally) invariably pay the largest share
But the point is that the heaviest users(semitrucks) cause almost all of the damage (literally >99%) but don't pay for most of the maintenance. This represents a subsidy of trucking companies. They cause damage that they don't pay for. This is an example of the economic concept of an externality, which is bad and should be eliminated.
But the point is that the heaviest users(semitrucks) cause almost all of the damage (literally >99%) but don't pay for most of the maintenance. This represents a subsidy of trucking companies. They cause damage that they don't pay for. This is an example of the economic concept of an externality, which is bad and should be eliminated.