## 4 Results and Discussion
### Measurement Results with Electric, Hybrid, and VAN
Thus, the data obtained can be used as input values for software that can determine the center of gravity's position, or the data on the center of gravity's position can be used as control data for such software calibration. To compare the results, Figures 10-12 contain data from publication [105], supplemented with data from the vehicles measured in this paper. Figure 9 shows the center of gravity's heights depending on the model year. The vehicles are divided by color according to their body type. The figure also includes the center of gravity's heights of the vehicles measured in this article, and they are marked by the triangle sign. Figure 10: Center of gravity and model year. Figure 9: Position of the center of gravity of electric, hybrid, and VAN. The hatchback, SUV, and VAN vehicles have average center of gravity heights compared to other vehicles, as follows from Figure 10. These vehicles are equipped with combustion engines. Hybrid and electric vehicles have lower centers of gravity compared to other vehicles. A significant decrease in the center of gravity is in the hybrid, even though it is an SUV. Compared to other SUVs, the center of gravity is substantially lower since the batteries are located in the floor. Although the electric vehicle also has the battery located in its floor, and it is overall lower than the hybrid, the center of gravity's height is the same. This is owing to the relatively large diameters of the wheels as well as the higher position of the engine. As also follows from Figure 10, a gradual increase in electric cars  
Figure 11: Center of gravity and vehicle mass. Figure 12: SSF and vehicle mass. and hybrids may bring a more radical decrease in the average center of gravity's height, and it must be reflected in further simulations as well as for reconstructions of car accidents. Thus, in these cases, it will be necessary to have a simple and available methodology for determining the height of the center of gravity as well as data on the center of gravity's height of the current vehicles. The height of the vehicles' center of gravity that depends on their total mass is given in Figure 11. Like in Figure 10, the data of vehicles determined in this publication are marked by the triangle sign. The center of gravity's height of the vehicles increases together with their total mass. Such a trend has been approved by the compared vehicles as well as vehicles of which the heights were determined in this article, as follows from Figure 11. The exception was only the hybrid, which has its battery located in the floor. For better comparison, Figure 12 shows the SSF of the vehicles related to the total mass. Like in Figures 10 and 11, Figure 12 shows the values compared to other vehicles. The values of the vehicles assessed in this article are marked by triangle signs. The highest values of SSF, i.e., the lowest risk of overturning, were in the hybrid vehicles (1.59) and the electric vehicle (1.58). Another indicator that assesses the impact of the center of gravity's height on the vehicle driving performances is the dependence of SSF on the roof-height-to-track-width ratio (Figure 13). The value of SSF decreases visibly together with increasing value of the ratio of the roof height and track width. Again, the hybrid and the electric slightly differs from this trend (Figure 13).