Flexible pavements constructed over expansive soil suffer from longitudinal cracking, rutting, surface depressions, and shoulder dropping problems. Rehabilitation of these roads can be done by replacing the existing base layer with Recycled Asphalt Pavement (RAP) material. However, the use of 100% RAP in the base layer is not feasible due to its excessive lateral movements and permanent deformations. Geocell can be used as reinforcement for the base layer constructed with RAP, which helps to address these problems. In this study, a test section was constructed with 4-inch thick high-density polyethylene (HDPE) geocell and filled with RAP material. The performance of the test section has been monitored from the load and deformation sensors, topographic survey, and visual inspection methods. Initial results obtained from the field sensors indicate that the utilization of geocell in the base layer reduces the stresses on the subgrade layer, and only negligible deformations were measured under the base layer.