![]() Therefore, this study aimed to verify the effect on national pavement performance due to the use of the default axle load spectra that are available on both software versions. However, characteristics of the Brazilian traffic are different from characteristics in the United States. In both software versions, default values were developed from traffic data of the United States. Based on this method, the MEPDG (Mechanistic-Empirical Pavement Design Guide) software was developed and later, its improved version, the AASHTO Ware Pavement ME Design. Due to the number of variables that can influence an empirical analysis, the National Cooperative Highway Research Program (NCHRP) proposed a mechanistic-empirical method. Currently, methods used for pavement design are empirical and based on experiments conducted in the 1960s.
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