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