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... SUMMARY In 2008, AASHTO published the Mechanistic-Empirical Pavement Design Guide: A Manual of Practice (MEPDG) and released the first version of the accompanying software program AASHTOWare Pavement ME Design™ (formerly DARWin-ME)
From page 2...
... 2 of unbonded JPCP overlays of existing JPCP, JPCP overlays of existing asphalt pavements, and bonded concrete overlays of existing JPCP. In relation to MEPDG input values, agencies responded that, for the most part, the MEPDG default or agency-determined regional values are being used to characterize traffic and materials inputs (excluding truck volume and vehicle class distribution, which is predominately based on site-specific input values)

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