The HDM-4 (Highway Development Management) models used for pavement management activities must be adapted to specific conditions of the country or region where they are to be used by adjusting certain calibration factors. This work presents results obtained from the calibration of structural cracking models in HDM-4 version 1.1, and comparing the results from equivalent HDM-III models. The ''windows''methodology is used to reconstruct the distress performance curve of a specific road category based on the observation of
