On which side is the truck?
The truck is on the left of the image.
    src        edge_attr  dst
0     2   to the left of   14
1     6   to the left of   14
2     6   to the left of   15
3     7   to the left of    8
4     7   to the left of   12
5     8  to the right of   15
6     8  to the right of   18
7     8  to the right of    7
8     8  to the right of   17
9     8  to the right of   14
10   12               on   18
11   12  to the right of   17
12   12  to the right of   18
13   12  to the right of    7
14   13  to the right of   14
15   13  to the right of   15
16   14   to the left of    8
17   14  to the right of    2
18   14  to the right of    6
19   14   to the left of   13
20   15   to the left of    8
21   15  to the right of    6
22   15   to the left of   13
23   17   to the left of   12
24   17   to the left of    8
25   18   to the left of    8
26   18   to the left of   12