There is a trend to work with the influence of roads on the whole society. The quality level, and the initial investment cost, for pavements and road superstructures, should therefore be grounded on Life Cycle Cost analysis (LCC). LCC or Whole Life Costing (WLC), is described in a PIARC document (ISBN: 2-84060-114-1), written by the author of this paper. LCC analyses are often grounded on an economic model, which is called the Net Present Cost (NPC).