## 4 Results and Discussion
### Measurement Results with Hatchback
Moreover, this change in load can lower the risk of oversteer skid, since the load distribution is the closest to the same load of the front and rear axle, and the center of gravity is located approximately in the middle between the front and rear axles [77]. \begin{table}
\begin{tabular}{c c c c} \hline
**Variant** & \
\begin{tabular}{c} **Measured Vehicle** \\ **Mass (kg)** \\ \end{tabular} &
\begin{tabular}{c} **Theoretical** \\ **Vehicle Mass (kg)** \\ \end{tabular} & **Deviation (\%)** \\ \hline Load in the & & 1511.0 & 1510.5 & +0.03 \\ luggage compartment & 1511.5 & 1510.5 & +0.06 \\ Load on the rear seats & 1511.5 & 1510.5 & +0.06 \\ Load in the luggage compartment and in the & 1522.0 & 1522.0 & 0.00 \\ roof box & & & \\ Load in the roof box only & 1388.0 & 1381.0 & +0.50 \\ Load on the rear seats and in & 1522.5 & 1522.0 & +0.03 \\ the roof box & & & \\ Load on the rear seats, empty & 1523.0 & 1522.0 & +0.06 \\ roof box & & & \\ Load in the luggage compartment, empty roof box & 1523.0 & 1522.0 & +0.06 \\ Empty vehicle, empty roof box & 1317.0 & 1317.0 & 0.00 \\ \hline \end{tabular}
\end{table} 
Table 4: Measured deviations of hatchback. \begin{table}
\begin{tabular}{c c c c c c c} \hline
**Variant** & \begin{tabular}{c} **Front Axle** \\ **Load (\%)** \\ \end{tabular} & \begin{tabular}{c} **Rear Axle** \\ **Load (\%)** \\ \end{tabular} & \begin{tabular}{c} **Change (\%)** \\ \end{tabular} & \begin{tabular}{c} **L1 (m)** \\ \end{tabular} & \
\begin{tabular}{c} **L2 (m)** \\ \end{tabular} &
\begin{tabular}{c} **Change (m)** \\ \end{tabular} \\ \hline Empty vehicle & 60.44 & 39.56 & 0.00 & 1.05 & 1.60 & 0.00 \\ Load in the luggage compartment & 51.39 & 48.61 & 9.05 & 1.29 & 1.36 & 0.24 \\ Load on the rear seats & 54.75 & 45.25 & 5.69 & 1.20 & 1.45 & 0.15 \\ Load in the luggage compartment and in the & 52.96 & 47.04 & 7.48 & 1.25 & 1.40 & 0.20 \\ roof box & & & & & \\ Load in the roof box only & 58.72 & 41.28 & 1.72 & 1.09 & 1.56 & 0.04 \\ Load on the rear seats and & & & & & & \\ In the roof box & & & & & & \\ Load on the rear seats, empty roof box & & & & & \\ Load in the luggage compartment, empty roof box & & & & & \\ Compartment, empty roof box & & & & & & \\ Empty vehicle, empty roof box & & & & & \\ \hline \end{tabular}
\end{table} 
Table 5: Division of vehicle mass into the front and rear axles of hatchback and the distance of the center of gravity from the axles. The center of gravity in the horizontal direction shifted towards the rear axle by 25 cm due to unloading into the luggage compartment and fitting the empty roof box, as follows from Table 5 as well. This was achieved by the load weighing 205 kg and the empty roof box weighing 11.5 kg. The load capacity of the hatchback was 447 kg. This means that there was not even half of the load capacity used, and despite this, the shifts in the position of the center of gravity in the horizontal direction do have an impact on the vehicle driving performances, as also mentioned in publication [78]. The authors of Ref. [79] conclude, in relation to a similar tire as used with the Kia Ceed, a strong dependence between the tire load and slip, contact area pressure distribution, tire contact area maximum pressure value, lateral tire deflection, and cornering stiffness. The height of the center of gravity and its change due to load distribution of the Hatchback with a weight not reaching even half of the load capacity are given in Table 6. The higher the center of gravity, the higher the risk of overturning and the more the axle load changes during braking [80; 81]. The load placed on the rear seats and in the roof box caused an increase in the height of the center of gravity by 11 cm, which is 19.64%. The vehicle body dropped by 4.5 cm at maximum load, 216.5 kg. The suspension stiffness is thus 1 cm for every 48 kg. The driver can affect the risk of overturning by distributing the load to a large extent, as also follows from Table 5. The worst load stowage was when the load was on the rear seats and in the roof box.