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The performance of the modified asphalt concrete pavement structure is done because of the increasing traffic load that occurs along with population growth. The study is needed to review the pavement structure whether it is still able to withstand the load or not at all. An Evaluation was carried out using Falling Weight Deflectometer (FWD) field data to obtain deflection data. Laboratory testing of UMATTA used modified asphalt mixture using Polyethylene Terephthalate (PET) type plastic bottle waste to obtain the relative strength coefficient value as an application combined with secondary data from average daily traffic data on the roads of the Batas Medan City– Batas Lubuk Pakam City. Structural analysis shows that the entire segment requires an added layer with the thickness that is different due to the segmentation performed. This study to maintain the required service level, namely SCI>1, the pavement must receive periodic maintenance and routine maintenance. elated to using asphalt modification using PET will produce a lower pavement thickness of 11 cm compared to the pavement thickness by the 2017 Pavement Design Manual standard of 16 cm.