Is there a bus in the picture?
Yes, there is a bus.
    src        edge_attr  dst
0     0  to the right of    3
1     0   to the left of    9
2     1   to the left of    4
3     2          wearing    7
4     2  to the right of   14
..  ...              ...  ...
61   15   to the left of   13
62   15   to the left of    2
63   15  to the right of    4
64   15   to the left of    7
65   15   to the left of   14

[66 rows x 3 columns]