## 3 Results and Discussion
### Electromagnetic Field on Different European Roads
#### 3.1.7 The Republic of Serbia  
In the Republic of Serbia, electric field measurements were carried out in the car cabin during driving on the motorways (A1 and A4), as shown in Figures 19-25. The selected driving roads are part of the International E-road network: E 70, E75, and E80. Figure 18: Slovenia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 19: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 20: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 21: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 22: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 23: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 24: The Republic of Serbia: (**a**) Boxplot showing total electric field (\(E_{total}\)) and electric field on each axis (\(E_{x}\), \(E_{y}\), and \(E_{z}\)). The central dotted line in the box shows the median, and the bottom and top edges are the 25 th and 75 th percentiles, respectively; (**b**) Map showing the selected road on which measurements were taken. Figure 19 and Table 3 show that the \(E_{total}\) mean value in the car's cabin during driving on E80 is 0.22 V/m, the lower quartile is 0.16 V/m, the median is 0.21 V/m, and the upper quartile is 0.27 V/m. From the data in Figures 20-22, we see that the lower quartile (Q1 = 0.18 V/m), median (Q2 = 0.23 V/m) and upper quartile (Q3 = 0.29 V/m) are about the same for the \(E_{total}\) distributions in the car's cabin during driving on the road sections on A1 motorways between points P2 RS-P3 RS, P3 RS-P4 RS, and P4 Rs-P5 RS. In the road section between points P6 RS-P7 RS, the highest value of \(E_{total}\) was 7.76 V/m. The lower quartile (Q1 = 0.27 V/m), median (Q2 = 0.47 V/m), and upper quartile (Q5 = 0.91 V/m) in this road section were higher than the lower quartile, median, and upper quartile in other road sections in the Republic of Serbia. This road section passes through Belgrade, the capital of the Republic of Serbia. This is a very densely populated urban area in which there are a large number of sources of EMFs, such as the antennas of cellular network base stations near the roadway. In our opinion, this is the reason for higher measured EMF values for the three components of the E-field.