The condition of road is currently assumed to be homogeneous across the width of a lane, when measuring using both Falling weight deflectometer (FWD) and Traffic Speed Deflectometer (TSD). It is however a well-known fact that the condition of a road can vary drastically even over short distances, in the longitudinal direction. Based on this fact, the assumption that the conditions do not vary in transverse direction seams a little crude. The goal of this paper is to show that there in fact is significant variations in the transverse direction of pavements. Using a TSD with measuring beams in both wheel paths, has helped to form a better understanding of what happens in the transverse direction of the road, as well as providing a more accurate picture of where weaknesses occur. This article will focus on the significance of measuring with two beams at once and how this can help provide a clearer picture of what happens in the transverse direction of the pavement.