Do you see either cars or trucks in the image?
No, there are no cars or trucks.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    1
2     1  to the right of    6
3     1  to the right of    3
4     1  to the right of    0
5     2           behind    7
6     2  to the right of    7
7     2  to the right of    0
8     3            below    5
9     3             near    7
10    3   to the left of    6
11    3   to the left of    1
12    5            above    7
13    6   to the left of    1
14    6  to the right of    3
15    7   to the left of    2
16    7      in front of    2
17    7             near    3