What is that bus pulled by?
The bus is pulled by the truck.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of   17
2     0  to the right of   18
3     0   to the left of    2
4     1   to the left of    2
..  ...              ...  ...
89   23  to the right of   18
90   23   to the left of   15
91   23   to the left of    2
92   23   to the left of   17
93   23  to the right of   21

[94 rows x 3 columns]