Which side of the image is the trailer on?
The trailer is on the right of the image.
    src        edge_attr  dst
0     1  to the right of    3
1     1   to the left of    2
2     1   to the left of    4
3     2   to the left of    8
4     2   to the left of   11
..  ...              ...  ...
81   20  to the right of    8
82   21  to the right of    8
83   21  to the right of    4
84   21  to the right of   16
85   21   to the left of   13

[86 rows x 3 columns]