Over the past thirty years Pennsylvania has seen an increase in superloads exerted on pavements. Superloads are typically defined as vehicles weighing greater than 200,000 pounds. The effects of these superloads on jointed plain concrete pavements (JPCP) as compared to standard truck loads are not well defined. The purpose of this paper is to study the effects of these superloads on the performance of JPCP joints and compare them to the effect of standard traffic loading conditions. One mechanism of failure at the transverse joints in JPCP is the degradation of dowel performance. This can result in the decreased effectiveness of the joint load transfer efficiency (LTE), which can result in large differential deflections and faulting between slabs. Therefore, to quantify the damage caused by superloads, typical loading profiles were developed using superload permit data obtained from Pennsylvania Department of Transportation (PennDOT). Typical traffic loading conditions were established by using default traffic conditions in the current design procedure Pavement Mechanistic-Empirical (ME). Using the typical superload profiles established from permit data, the effect on dowel performance can be quantified. The effects of superloads are then compared to the effects of standard traffic loadings from Pavement ME on the joint performance.