Surely making the user pay the full costs is a cost play! Even if it was possible to calculate the costs to an individual level, making road users, or the user of any government service pay the true cost of that service is a truly awful idea unless you think only the wealthy should be allowed to use the roads?It's not supposed to be a cost play. By having the user pay the true costs, their behaviours would be changed, as their decisions would be based on the cost to society in general.