Is there either a fence or a bus?
No, there are no fences or buses.
    src        edge_attr  dst
0     0  to the right of    3
1     0  to the right of   11
2     0  to the right of   16
3     0  to the right of    9
4     0  to the right of    8
..  ...              ...  ...
69   17  to the right of   11
70   19   to the left of    8
71   19   to the left of    3
72   19   to the left of   11
73   20   to the left of    8

[74 rows x 3 columns]