Today's large and heavy equipment causes soil compaction, which can be minimized by concentrating all traffic to specific locations in the field. The concept is called Controlled Traffic Farming (CTF). Today there is also a strong trend to reduce the cultivation intensity. CTF reduces the need for soil loosening and thus cultivation needs, and leads to lower energy consumption. This, together with cheaper auto steering of tractors, makes more and more Swedish farmers interested in the technology. However, farmers hesitate to invest without an adequate basis for their decision. Therefore it´s essential that the only existing Swedish CTF-trials (two traditional block trials and large plots at a farm) will continue. The aim of the experiments is to study the effect of concentrating traffic vs random traffic of otherwise equivalent cultivation system. In the project there will be harvest measurements in and between tracks, soil physical measurements, and economic assessment of the outcome.