The problem that we approach in the present work of investigation, arises as need to improve the local way Rioja- Posic 1 plan of the km 00+000 to the km 6+090, District and PfóViñéé óf Riójá, Régióñ Sáñ Mái'tiñ. lnside the parameters of the improvement there arises as need the structural design of the flexible pavement, for what the author, tries to give solution to the need that one has pféséñtéél üsiñg ttié " Méttióél Nátióñál Assóéiátióñ óf Aüsti'áliáfl Státé Róáél Aüttiófitiés": Vialidad;s National Ássociation of the State of Áustraiia (NAASRA). The Method NAASRA, it relates the value support of the soil (CBR) that is obtained by means of tne stüaies óf mecnañiéS óf soils ana tne Jóaéls peífórmers o;; tné róáél-oéO, expressed in number of repetltions of Equlvaient Áxes (EE) that are obtalned by the studies of traffic; pa...