Are there any helmets or fences?
Yes, there is a fence.
    src        edge_attr  dst
0     0   to the left of   19
1     0   to the left of    2
2     0  to the right of    1
3     0   to the left of   15
4     0   to the left of    3
..  ...              ...  ...
72   24   to the left of    6
73   26               on   27
74   26  to the right of   20
75   27  to the right of   20
76   27  to the right of   10

[77 rows x 3 columns]