Are there any buses or cars?
Yes, there is a bus.
    src        edge_attr  dst
0     0  to the right of    8
1     0   to the left of    6
2     1   to the left of   14
3     1   to the left of   17
4     1  to the right of    8
..  ...              ...  ...
69   20   to the left of    4
70   20   to the left of   17
71   20   to the left of    5
72   20   to the left of    6
73   20   to the left of   14

[74 rows x 3 columns]