shows the current benefits in millions of United States
dollars when the resources stem from the public budget. The
analysis focuses on two productivity scenarios ~1.2 and 1.5!—
enough to compare the effects of increases in the productivity
level of management work. In this case, current benefits are estimated
as a function of the percentage of the a priori most adequate
maintenance expenses ~2.5% RRV!. The current user benefit
undergoes continuous growth that gradually tails off. Thus,
the marginal benefit for users continuously drops. Moreover, the
current benefit for the public sector goes down as the maintenance
expenses go up. This situation stems from the fact that the rise in
maintenance expenses is not offset by the increase in tax collection
as a result of traffic growth. Obviously, the external benefits
gradually expand as the amount of resources increase