Are there any fences or helmets?
Yes, there is a helmet.
    src        edge_attr  dst
0     1   to the left of   17
1     1               on   13
2     1   to the left of    3
3     1   to the left of   10
4     1   to the left of    4
..  ...              ...  ...
68   18               of    1
69   19   to the left of   17
70   19               of   12
71   20  to the right of    2
72   20   to the left of   15

[73 rows x 3 columns]