## 5 Conclusions  
This paper presented the results of the research regarding the parameters of tire footprints; the experiment was conducted in controlled conditions using an innovative 3D scanning method. The analyzed parameters were the width of the footprint, the length of the footprint, the depth of the footprint, the area of the cross-section of the tire, and the actual area of the footprint.  
Based on the results of the conducted research, the following conclusions were formulated:1. A bias-ply tire subjected to changes in operating parameters reacts to a lesser extent to changes in footprint parameters compared to a radial tire. Due to the stiffer structure confirmed through small changes in the cross-section, increasing the inflation pressure and vertical load causes the tire to sink into the ground significantly. The observed large increase in the footprint area after increasing the vertical load and pressure is caused by the large footprint effect--the footprint area also includes its vertical parts that do not carry vertical loads.
2. A bias-ply tire is more susceptible to deformations caused by inflation pressure changes. Pressure reduction results in a large increase in the width of the footprint and a slightly smaller increase in its length. Therefore, it is of a different deformation character than in a radial tire. At the same time, as a result of inflation pressure reduction, increases are observed both in the cross-section area of the tire and in the footprint area. This first increase means the greater flexibility of a radial tire compared to a bias-ply one. As for the increase in the footprint area, it was more intense than the increase in depth, which indicated that the tire adapted to the ground better. Increasing the vertical load resulted in an increase in all analyzed parameters except the footprint depth, which confirms the theory that the radial tire adapts better to the ground.
3. A correct analysis of the impact of agricultural tires on the soil should take into account not only the footprint area but also changes in parameters such as the width, length, and depth of the rut. Additionally, a parameter related to the tire's deformability should be taken into account. The analysis of the footprint itself may lead to erroneous conclusions because the surface also includes parts with a more vertical profile that carry loads to a small extent. As a result, with a large footprint area and a simultaneous large depth, the actual surface carrying vertical loads is smaller than the measured footprint area.  
In the experiments, there were the following limitations: a specified range of vertical loads and inflation pressures and one type of soil and static conditions. In further research, the range of the factors should be extended. For this reason, there are plans to determine the impact of rolling wheels on different agricultural soils under field conditions. These experiments will be conducted in a wide range of vertical loads and inflation pressures.  
Conceptualization, A.M. and W.P.; methodology, J.C.; software, M.B. and A.M.; validation, A.M. and M.B.; formal analysis, J.C. and K.L.; investigation, A.M., W.P. and M.B.; resources, A.M. and W.P.; data curation, M.B.; writing--original draft preparation, A.M. and M.B.; writing--review and editing, M.B.; visualization, W.P.; supervision, J.C.; project administration, J.C. and K.L.; funding acquisition, J.C. and K.L. All authors have read and agreed to the published version of the manuscript.  
The article processing charge was financed by the Wroclaw University of Environmental and Life Sciences.  
Not applicable.  
Data Availability Statement: Data are contained within the article.  
The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of the data; in the writing of the manuscript or in the decision to publish the results.