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Geogrids are used in the reinforcement of unbound layers. One application of geogrids is in the reinforcement of flexible pavement. In this study, the authors prepared a large-scale tank to study the change in performance of a full pavement structure when geogrids were incorporated. The geogrid mesh was placed at the interface between the base and asphalt concrete layers. The tank dimensions were designed such that its boundaries would not interfere with the soil stresses. Dynamic loading was applied on the samples and the stresses in the subgrade and base layers were measured using preinstalled pressure gauges. A statistical analysis was done to compare the performance of both conditions. The results showed that rutting in the case of the unreinforced sample was significantly higher than for the reinforced sample. The presence of the geogrids also reduced the stresses induced in the subgrade and base layers at all measured points, except under the point of load application where stress increased.